在等待一段时间之后，重新开始，重复读取每个文件描述符。

After you wait for some amount of time, you start over again by repeatedly reading each file descriptor.

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现在，等待至少30秒，然后重复步骤f。

Now, wait for at least 30 seconds and repeat step f.

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每一个用户都会执行一个测试用例然后等待120秒再去重复用例。

Each user performs a use case and then waits for 120 seconds before repeating the use case.

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