update lending contract

contracts/interfaces/ILending.sol

@@ -27,7 +27,6 @@ interface ILending {
     function withdraw(uint256 amount) external;
     function supplyCollateral(address asset, uint256 amount) external;
     function withdrawCollateral(address asset, uint256 amount) external;
-    function borrow(uint256 amount) external;
     function absorb(address borrower) external;
     function absorbMultiple(address absorber, address[] calldata accounts) external;
     function buyCollateral(address asset, uint256 minAmount, uint256 baseAmount, address recipient) external;

contracts/ytLending/Configurator.sol

@@ -50,8 +50,7 @@ contract Configurator is
         Configuration memory oldConfiguration = configuratorParams[lendingProxy];
         
         if (oldConfiguration.baseToken != address(0) &&
-            (oldConfiguration.baseToken != newConfiguration.baseToken ||
+            oldConfiguration.baseToken != newConfiguration.baseToken)
-             oldConfiguration.trackingIndexScale != newConfiguration.trackingIndexScale))
             revert ConfigurationAlreadyExists();
 
         delete configuratorParams[lendingProxy];
@@ -67,7 +66,6 @@ contract Configurator is
         configuratorParams[lendingProxy].borrowPerYearInterestRateSlopeHigh = newConfiguration.borrowPerYearInterestRateSlopeHigh;
         configuratorParams[lendingProxy].borrowPerYearInterestRateBase = newConfiguration.borrowPerYearInterestRateBase;
         configuratorParams[lendingProxy].storeFrontPriceFactor = newConfiguration.storeFrontPriceFactor;
-        configuratorParams[lendingProxy].trackingIndexScale = newConfiguration.trackingIndexScale;
         configuratorParams[lendingProxy].baseBorrowMin = newConfiguration.baseBorrowMin;
         configuratorParams[lendingProxy].targetReserves = newConfiguration.targetReserves;
         

contracts/ytLending/Lending.sol

@@ -51,7 +51,6 @@ contract Lending is
         borrowPerSecondInterestRateBase = uint64(config.borrowPerYearInterestRateBase / SECONDS_PER_YEAR);
         
         storeFrontPriceFactor = config.storeFrontPriceFactor;
-        trackingIndexScale = config.trackingIndexScale;
         baseBorrowMin = config.baseBorrowMin;
         targetReserves = config.targetReserves;
         
@@ -211,36 +210,6 @@ contract Lending is
         emit WithdrawCollateral(msg.sender, msg.sender, asset, amount);
     }
 
-    function borrow(uint256 amount) external override nonReentrant whenNotPaused {
-        accrueInterest();
-        
-        UserBasic memory user = userBasic[msg.sender];
-        int104 oldPrincipal = user.principal;
-        
-        uint256 index = oldPrincipal >= 0 ? supplyIndex : borrowIndex;
-        int256 oldBalance = LendingMath.principalToBalance(oldPrincipal, index);
-        
-        int256 newBalance = oldBalance - int256(amount);
-        
-        if (newBalance < 0 && uint256(-newBalance) < baseBorrowMin) revert BorrowTooSmall();
-        
-        uint256 newIndex = newBalance >= 0 ? supplyIndex : borrowIndex;
-        int104 newPrincipal = LendingMath.balanceToPrincipal(newBalance, newIndex);
-        
-        (uint104 withdrawAmount, uint104 borrowAmount) = LendingMath.withdrawAndBorrowAmount(oldPrincipal, newPrincipal);
-        
-        totalSupplyBase -= withdrawAmount;
-        totalBorrowBase += borrowAmount;
-        
-        userBasic[msg.sender].principal = newPrincipal;
-        
-        if (!_isSolvent(msg.sender)) revert InsufficientCollateral();
-        
-        IERC20(baseToken).safeTransfer(msg.sender, amount);
-        
-        emit Withdraw(msg.sender, msg.sender, amount);
-    }
-
     function _absorbInternal(address absorber, address borrower) internal {
         if (!isLiquidatable(borrower)) revert NotLiquidatable();
         

contracts/ytLending/LendingConfiguration.sol

@@ -26,7 +26,6 @@ contract LendingConfiguration {
         uint64 borrowPerYearInterestRateBase;           // 借款基础利率
         
         uint64 storeFrontPriceFactor;                   // 清算价格折扣
-        uint64 trackingIndexScale;                      // 追踪索引比例
         uint104 baseBorrowMin;                          // 最小借款额
         uint104 targetReserves;                         // 目标储备金
         

contracts/ytLending/LendingStorage.sol

@@ -19,7 +19,6 @@ abstract contract LendingStorage is LendingConfiguration {
     uint64 public borrowPerSecondInterestRateBase;
     
     uint64 public storeFrontPriceFactor;
-    uint64 public trackingIndexScale;
     uint104 public baseBorrowMin;
     uint104 public targetReserves;
     

doc/YT-Lending借贷系统操作流程图.md

@@ -602,7 +602,7 @@
 
 ---
 
-## 5. 借款流程（Borrow）
+## 5. 借款流程（Withdraw，如果余额不足会自动借款）
 
 ```
 ┌─────────────────────────────────────────────────────────────────────┐
@@ -614,12 +614,12 @@
 │  计划: 借款 1,000,000 USDC                                            │
 └────────────────────────────┬────────────────────────────────────────┘
                              │
-                             │ 1. 调用 borrow(1000000e6)
+                             │ 1. 调用 withdraw(1000000e6)进行借款
                              ▼
 ┌─────────────────────────────────────────────────────────────────────┐
-│                    Lending.borrow()                                   │
+│                    Lending.withdraw()                                   │
 │  ─────────────────────────────────────────────────────────────────  │
-│  function borrow(uint256 amount)                                      │
+│  function withdraw(uint256 amount)                                      │
 │      • 非重入保护: nonReentrant                                       │
 │      • 暂停检查: whenNotPaused                                        │
 │      • 参数: 1,000,000 USDC (1000000e6)                               │
@@ -1824,7 +1824,6 @@ Configuration {
     
     // 清算参数
     storeFrontPriceFactor: 0.95e18              // 清算购买折扣 5%
-    trackingIndexScale: 1e15                    // 追踪索引比例
     baseBorrowMin: 100e6                        // 最小借款 100 USDC
     targetReserves: 5000000e6                   // 目标储备 500万
     

out/LendingConfiguration.sol/LendingConfiguration.json

@@ -1 +1 @@
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+{"abi":[],"bytecode":{"object":"0x608080604052346013576039908160188239f35b5f80fdfe5f80fdfea2646970667358221220f8112b2e9d03bdb94e5e5cd9ad0c208785a05e855bbd3fb5fb6de208e49fa01864736f6c634300081e0033","sourceMap":"57:1599:11:-:0;;;;;;;;;;;;;;;;;","linkReferences":{}},"deployedBytecode":{"object":"0x5f80fdfea2646970667358221220f8112b2e9d03bdb94e5e5cd9ad0c208785a05e855bbd3fb5fb6de208e49fa01864736f6c634300081e0033","sourceMap":"57:1599:11:-:0;;","linkReferences":{}},"methodIdentifiers":{},"rawMetadata":"{\"compiler\":{\"version\":\"0.8.30+commit.73712a01\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"kind\":\"dev\",\"methods\":{},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"contracts/ytLending/LendingConfiguration.sol\":\"LendingConfiguration\"},\"evmVersion\":\"prague\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[\":@arbitrum/=node_modules/@arbitrum/\",\":@chainlink/=node_modules/@chainlink/\",\":@ensdomains/=node_modules/@ensdomains/\",\":@eth-optimism/=node_modules/@chainlink/contracts/node_modules/@eth-optimism/\",\":@offchainlabs/=node_modules/@offchainlabs/\",\":@openzeppelin/=node_modules/@openzeppelin/\",\":@scroll-tech/=node_modules/@scroll-tech/\",\":@zksync/=node_modules/@zksync/\",\":forge-std/=lib/forge-std/src/\",\":hardhat/=node_modules/hardhat/\",\":solady/=node_modules/solady/\"],\"viaIR\":true},\"sources\":{\"contracts/ytLending/LendingConfiguration.sol\":{\"keccak256\":\"0x5bc25b91410dd160bbb8d141b079b269b82677dab41b65742ae757df6da889bd\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://d721d8b4c60e7f495586426d71fc9d03c8c2615f0005b90d2a3d85ef1a7ae3b9\",\"dweb:/ipfs/QmTBUTpF22QVJYYF6f72bqBWKvdgj8ottEVc2QXgVBcYnk\"]}},\"version\":1}","metadata":{"compiler":{"version":"0.8.30+commit.73712a01"},"language":"Solidity","output":{"abi":[],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"remappings":["@arbitrum/=node_modules/@arbitrum/","@chainlink/=node_modules/@chainlink/","@ensdomains/=node_modules/@ensdomains/","@eth-optimism/=node_modules/@chainlink/contracts/node_modules/@eth-optimism/","@offchainlabs/=node_modules/@offchainlabs/","@openzeppelin/=node_modules/@openzeppelin/","@scroll-tech/=node_modules/@scroll-tech/","@zksync/=node_modules/@zksync/","forge-std/=lib/forge-std/src/","hardhat/=node_modules/hardhat/","solady/=node_modules/solady/"],"optimizer":{"enabled":true,"runs":200},"metadata":{"bytecodeHash":"ipfs"},"compilationTarget":{"contracts/ytLending/LendingConfiguration.sol":"LendingConfiguration"},"evmVersion":"prague","libraries":{},"viaIR":true},"sources":{"contracts/ytLending/LendingConfiguration.sol":{"keccak256":"0x5bc25b91410dd160bbb8d141b079b269b82677dab41b65742ae757df6da889bd","urls":["bzz-raw://d721d8b4c60e7f495586426d71fc9d03c8c2615f0005b90d2a3d85ef1a7ae3b9","dweb:/ipfs/QmTBUTpF22QVJYYF6f72bqBWKvdgj8ottEVc2QXgVBcYnk"],"license":"MIT"}},"version":1},"id":11}

out/build-info/f52e10224748efca.json

@@ -0,0 +1 @@
+{"id":"f52e10224748efca","source_id_to_path":{"0":"contracts/interfaces/ILending.sol","1":"contracts/interfaces/IUSDY.sol","2":"contracts/interfaces/IYTAssetVault.sol","3":"contracts/interfaces/IYTLPToken.sol","4":"contracts/interfaces/IYTLendingPriceFeed.sol","5":"contracts/interfaces/IYTPoolManager.sol","6":"contracts/interfaces/IYTPriceFeed.sol","7":"contracts/interfaces/IYTVault.sol","8":"contracts/ytLending/Configurator.sol","9":"contracts/ytLending/ConfiguratorStorage.sol","10":"contracts/ytLending/Lending.sol","11":"contracts/ytLending/LendingConfiguration.sol","12":"contracts/ytLending/LendingFactory.sol","13":"contracts/ytLending/LendingMath.sol","14":"contracts/ytLending/LendingPriceFeed.sol","15":"contracts/ytLending/LendingStorage.sol","16":"contracts/ytLp/core/YTPoolManager.sol","17":"contracts/ytLp/core/YTPriceFeed.sol","18":"contracts/ytLp/core/YTRewardRouter.sol","19":"contracts/ytLp/core/YTVault.sol","20":"contracts/ytLp/tokens/USDY.sol","21":"contracts/ytLp/tokens/YTLPToken.sol","22":"contracts/ytVault/YTAssetFactory.sol","23":"contracts/ytVault/YTAssetVault.sol","24":"lib/forge-std/src/Base.sol","25":"lib/forge-std/src/StdAssertions.sol","26":"lib/forge-std/src/StdChains.sol","27":"lib/forge-std/src/StdCheats.sol","28":"lib/forge-std/src/StdConstants.sol","29":"lib/forge-std/src/StdError.sol","30":"lib/forge-std/src/StdInvariant.sol","31":"lib/forge-std/src/StdJson.sol","32":"lib/forge-std/src/StdMath.sol","33":"lib/forge-std/src/StdStorage.sol","34":"lib/forge-std/src/StdStyle.sol","35":"lib/forge-std/src/StdToml.sol","36":"lib/forge-std/src/StdUtils.sol","37":"lib/forge-std/src/Test.sol","38":"lib/forge-std/src/Vm.sol","39":"lib/forge-std/src/console.sol","40":"lib/forge-std/src/console2.sol","41":"lib/forge-std/src/interfaces/IMulticall3.sol","42":"lib/forge-std/src/safeconsole.sol","43":"node_modules/@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol","44":"node_modules/@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol","45":"node_modules/@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol","46":"node_modules/@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol","47":"node_modules/@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol","48":"node_modules/@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol","49":"node_modules/@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol","50":"node_modules/@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol","51":"node_modules/@openzeppelin/contracts/access/Ownable.sol","52":"node_modules/@openzeppelin/contracts/interfaces/IERC1363.sol","53":"node_modules/@openzeppelin/contracts/interfaces/IERC165.sol","54":"node_modules/@openzeppelin/contracts/interfaces/IERC1967.sol","55":"node_modules/@openzeppelin/contracts/interfaces/IERC20.sol","56":"node_modules/@openzeppelin/contracts/interfaces/draft-IERC1822.sol","57":"node_modules/@openzeppelin/contracts/interfaces/draft-IERC6093.sol","58":"node_modules/@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol","59":"node_modules/@openzeppelin/contracts/proxy/ERC1967/ERC1967Utils.sol","60":"node_modules/@openzeppelin/contracts/proxy/Proxy.sol","61":"node_modules/@openzeppelin/contracts/proxy/beacon/IBeacon.sol","62":"node_modules/@openzeppelin/contracts/token/ERC20/ERC20.sol","63":"node_modules/@openzeppelin/contracts/token/ERC20/IERC20.sol","64":"node_modules/@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol","65":"node_modules/@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol","66":"node_modules/@openzeppelin/contracts/utils/Address.sol","67":"node_modules/@openzeppelin/contracts/utils/Context.sol","68":"node_modules/@openzeppelin/contracts/utils/Errors.sol","69":"node_modules/@openzeppelin/contracts/utils/StorageSlot.sol","70":"node_modules/@openzeppelin/contracts/utils/introspection/IERC165.sol","71":"test/YtLending.t.sol","72":"test/YtLp.t.sol","73":"test/YtVault.t.sol"},"language":"Solidity"}

scripts/deploy/08-configureLending.ts

@@ -104,7 +104,6 @@ async function main() {
         borrowPerYearInterestRateBase: ethers.parseUnits("0.015", 18),      // 1.5% 基础
         
         storeFrontPriceFactor: ethers.parseUnits("0.5", 18),             // 50% 清算折扣
-        trackingIndexScale: ethers.parseUnits("1", 15),                  // 10^15 比例
         baseBorrowMin: ethers.parseUnits("100", USDC.decimals),          // 最小借 100 USDC
         targetReserves: ethers.parseUnits("5000000", USDC.decimals),     // 目标储备 500 万
         

test/YtLending.t.sol

@@ -156,7 +156,6 @@ contract YtLendingTest is Test {
             borrowPerYearInterestRateSlopeHigh: BORROW_RATE_HIGH,
             borrowPerYearInterestRateBase: BORROW_RATE_BASE,
             storeFrontPriceFactor: STORE_FRONT_PRICE_FACTOR,
-            trackingIndexScale: 1e15,
             baseBorrowMin: uint104(BASE_BORROW_MIN),
             targetReserves: uint104(TARGET_RESERVES),
             assetConfigs: assetConfigs
@@ -319,7 +318,7 @@ contract YtLendingTest is Test {
         
         // 借款 $16,000 USDC（80% LTV）
         uint256 borrowAmount = 16000e6;
-        lending.borrow(borrowAmount);
+        lending.withdraw(borrowAmount);
         vm.stopPrank();
         
         // 验证
@@ -335,7 +334,7 @@ contract YtLendingTest is Test {
         // Alice 尝试无抵押借款
         vm.prank(alice);
         vm.expectRevert(ILending.InsufficientCollateral.selector);
-        lending.borrow(1000e6);
+        lending.withdraw(1000e6);
     }
    
     function test_09_Borrow_FailBelowMinimum() public {
@@ -345,7 +344,7 @@ contract YtLendingTest is Test {
         
         // 尝试借款低于最小值 (< 100 USDC)
         vm.expectRevert(ILending.BorrowTooSmall.selector);
-        lending.borrow(50e6);
+        lending.withdraw(50e6);
         vm.stopPrank();
     }
    
@@ -361,7 +360,7 @@ contract YtLendingTest is Test {
         // Bob 存入 10 YTToken，借 8,000 USDC
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(8000e6);
+        lending.withdraw(8000e6);
         vm.stopPrank();
         
         // 时间前进 365 天
@@ -398,7 +397,7 @@ contract YtLendingTest is Test {
         // Bob 借款
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(8000e6);
+        lending.withdraw(8000e6);
         vm.stopPrank();
         
         // 每月触发一次利息累积（模拟复利）
@@ -426,7 +425,7 @@ contract YtLendingTest is Test {
         // Bob 存入 10 YTToken (价值 $20,000)，借 10,000 USDC
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(10000e6);
+        lending.withdraw(10000e6);
         vm.stopPrank();
         
         // LTV = 50%，健康
@@ -441,7 +440,7 @@ contract YtLendingTest is Test {
         // Bob 存入 10 YTToken，借 16,000 USDC（80% LTV）
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(16000e6);
+        lending.withdraw(16000e6);
         vm.stopPrank();
         
         // YTToken 价格暴跌到 $1,800
@@ -463,7 +462,7 @@ contract YtLendingTest is Test {
         // 1. Bob 建立借款头寸
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);  // 10 YTToken @ $2000 = $20,000
-        lending.borrow(16000e6);  // $16,000（80% LTV）
+        lending.withdraw(16000e6);  // $16,000（80% LTV）
         vm.stopPrank();
         
         // 2. 计算精确的清算价格（1e30 精度）
@@ -507,7 +506,7 @@ contract YtLendingTest is Test {
         // 1. Bob 建立不良头寸
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);  // 10 YTToken @ $2000 = $20,000
-        lending.borrow(16000e6);  // $16,000
+        lending.withdraw(16000e6);  // $16,000
         vm.stopPrank();
         
         // 2. YTToken 价格跌到 $1,750
@@ -544,12 +543,12 @@ contract YtLendingTest is Test {
         // 1. Bob 和 Charlie 都建立不良头寸
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(16000e6);
+        lending.withdraw(16000e6);
         vm.stopPrank();
         
         vm.startPrank(charlie);
         lending.supplyCollateral(address(ytVault), 5e18);
-        lending.borrow(8000e6);
+        lending.withdraw(8000e6);
         vm.stopPrank();
         
         // 2. 价格下跌
@@ -581,7 +580,7 @@ contract YtLendingTest is Test {
         // 1. 先清算一个账户，产生抵押品库存
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(16000e6);
+        lending.withdraw(16000e6);
         vm.stopPrank();
         
         ytFactory.updateVaultPrices(address(ytVault), 1750e30);
@@ -619,7 +618,7 @@ contract YtLendingTest is Test {
         // 设置清算库存
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(16000e6);
+        lending.withdraw(16000e6);
         vm.stopPrank();
         
         ytFactory.updateVaultPrices(address(ytVault), 1750e30);
@@ -649,7 +648,7 @@ contract YtLendingTest is Test {
         // Bob 小额借款
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);  // 10 YTToken @ $2000 = $20,000
-        lending.borrow(100e6);  // 只借 $100
+        lending.withdraw(100e6);  // 只借 $100
         vm.stopPrank();
         
         // 让时间流逝以累积利息，增加 reserves
@@ -701,7 +700,7 @@ contract YtLendingTest is Test {
         // Bob 借 5,000 USDC
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(5000e6);
+        lending.withdraw(5000e6);
         vm.stopPrank();
         
         // reserves = balance - totalSupply + totalBorrow
@@ -719,7 +718,7 @@ contract YtLendingTest is Test {
         
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(8000e6);
+        lending.withdraw(8000e6);
         vm.stopPrank();
         
         // 时间流逝
@@ -746,7 +745,7 @@ contract YtLendingTest is Test {
         
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(8000e6);
+        lending.withdraw(8000e6);
         vm.stopPrank();
         
         vm.warp(block.timestamp + 365 days);
@@ -799,7 +798,7 @@ contract YtLendingTest is Test {
         // Bob 借 8,000 USDC
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(8000e6);
+        lending.withdraw(8000e6);
         vm.stopPrank();
         
         // 利用率 = 8000 / 10000 = 80%
@@ -813,7 +812,7 @@ contract YtLendingTest is Test {
         
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(5000e6);
+        lending.withdraw(5000e6);
         vm.stopPrank();
         
         uint64 supplyRate = lending.getSupplyRate();
@@ -831,7 +830,7 @@ contract YtLendingTest is Test {
         
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(8000e6);
+        lending.withdraw(8000e6);
         vm.stopPrank();
         
         uint64 borrowRate = lending.getBorrowRate();
@@ -869,7 +868,7 @@ contract YtLendingTest is Test {
         lending.supplyCollateral(address(ytVault), 10e18);  // $20,000
         
         // 借款 $16,000（正好 80%）
-        lending.borrow(16000e6);
+        lending.withdraw(16000e6);
         
         // 应该成功
         assertEq(lending.borrowBalanceOf(alice), 16000e6, "Should borrow at max LTV");
@@ -887,7 +886,7 @@ contract YtLendingTest is Test {
         
         // 尝试借 $16,001（超过 80%）
         vm.expectRevert(ILending.InsufficientCollateral.selector);
-        lending.borrow(16001e6);
+        lending.withdraw(16001e6);
         vm.stopPrank();
     }
    
@@ -899,7 +898,7 @@ contract YtLendingTest is Test {
         // Alice 借款后尝试取出抵押品
         vm.startPrank(alice);
         lending.supplyCollateral(address(ytVault), 10e18);
-        lending.borrow(16000e6);
+        lending.withdraw(16000e6);
         
         // 尝试取出 1 YTToken 会破坏抵押率
         vm.expectRevert(ILending.InsufficientCollateral.selector);
@@ -929,13 +928,13 @@ contract YtLendingTest is Test {
         // 2. Bob 抵押借款
         vm.startPrank(bob);
         lending.supplyCollateral(address(ytVault), 20e18);  // $40,000
-        lending.borrow(30000e6);  // 75% LTV
+        lending.withdraw(30000e6);  // 75% LTV
         vm.stopPrank();
         
         // 3. Charlie 也抵押借款（更激进，容易被清算）
         vm.startPrank(charlie);
         lending.supplyCollateral(address(ytVault), 5e18);  // $10,000
-        lending.borrow(7900e6);  // 79% LTV
+        lending.withdraw(7900e6);  // 79% LTV
         vm.stopPrank();
         
         // 4. 时间流逝，利息累积