前置条件：函数开始之前，调用者应当满足的要求。
A requirement that should be satisfied by the caller before a function starts.
函数接收的参数可能有错，前置条件没有满足。
There is something wrong with the arguments the function is getting; a precondition is violated.
函数接收的参数可能有错，前置条件没有满足。
There is something wrong with the arguments the function is getting; a precondition is violated.
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