有多少任务需要其他任务作为前置条件？

How many tasks have other tasks as prerequisites?

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将异常处理改为断言去掉了前置条件赐予的保护膜。

Changing the exception to an assertion removed the blessed protection of the precondition tests.

youdao

用OVal为方法指定前置条件必须对方法参数进行标注。

To specify preconditions for a method with OVal, you must annotate method parameters.

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