这个标识符稍后将用于停止任务调度。
This identifier may be needed subsequently to stop task scheduling.
由于天气原因，邮政服务停止后，该机构的首要任务是确保员工的安全。
After mail service stops due to weather, the agency's top priority is ensuring that employees are safe.
这种模式在这样几种情形下是有用的，您可以知道一项任务何时开始以及何时停止，但是您没法知道任务进展了多远。
This mode is useful in situations where you know when a task starts and stops but have no way of knowing how far the task has progressed.
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