reentrancy guard

Adding a reentrancy guard prevents the same function from being called again before it completes.添加重入锁可以防止同一函数在完成之前被再次调用。

OpenZeppelin's ReentrancyGuard is the standard tool used by Solidity developers to prevent re-entrant calls.OpenZeppelin 的 ReentrancyGuard 是 Solidity 开发人员防止重入调用的标准工具。