转换和验证使您可以侧重于业务逻辑，而不是侧重于对输入数据进行繁琐的资格认定，比如null检验、长度限定、范围边界，等等。

Conversion and validation allow you to focus on business logic rather than the tedious qualifications of input data such as null checks, length qualifiers, range boundaries, etc.

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有一些法规限定，非法进入美国的人，基本上等于是自己关上了未来取得移民资格的大门，因为非法入境的纪录会很难洗刷。

There are a number of provisions that say if you come in illegally you basically close the door on future immigration. An illegal entry is something that is very difficult to overcome.

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