许多时候，只需通过检验参数并抛出特定异常说明提供参数无效的原因就可以实现这一点。

Many times, you can do this simply by verifying arguments and throwing specific exceptions that tell why the supplied arguments are invalid.

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同时也意味着掌握拍马的艺术：加州大学伯克利分校的詹妮弗·查特曼做了一些实验，她试图在试验中找到一个临界点，超过该点，拍马便无效。

It also means mastering the art of flattery: Jennifer Chatman, of the University of California, Berkeley, conducted experiments in which she tried to find a point at which flattery became ineffective.

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引用已释放的保存点是无效的，并导致一个错误。

Any reference to a released savepoint is invalid and results in an error.

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