这些就是前置条件，是客户端的义务。
These are pre-conditions, and they're obligations for the client.
成功待人处事是成为好医生的前置条件。
高危项目审批必须把安全生产作为前置条件。
High risk project approval must be safe production as a pre condition.
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.
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.
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.
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