这会导致流程片断多次执行，通常是持续到满足一定的退出条件为止。

This leads to process fragments that execute several times, often until a certain exit condition is satisfied.

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里程碑处的可交付内容，是用来为各个工作阶段定义退出条件的最常用的机制。

Milestone deliverables are the most commonly used mechanisms to define exit criteria for each phase of work.

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filter() 方法首先检查列表是否为空，这是该方法的重要退出条件。

The filter() method first checks to see if the list is empty — the critically important exit condition for this method.

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