In fact, the second type of error control is also essential.

其实，对于第二类错误的控制也是十分必要的。

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The second type of error is a runtime error, so called because the error does not appear until you run the program.

第二类错误是运行时错误，之所以称为运行时错误，是因为只有你运行了程序，错误才可能出现。

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In many cases, we tend to only pay attention to the control of the first type of error, while the second type of error often being not considered.

在很多时候，我们往往只注意第一类错误的控制，而对于第二类错误经常不考虑。

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