除了当事件发生时进行记录，当一个未来型事件应该发生时，几乎所有的应用程序都需要报告在两个时间或者计算之间已经过去的时间数量。
In addition to recording when an event happened, nearly all applications need to report the amount of time that has elapsed between two events or calculate when a future event should occur.
除了当事件发生时进行记录，当一个未来型事件应该发生时，几乎所有的应用程序都需要报告在两个时间或者计算之间已经过去的时间数量。
In addition to recording when an event happened, nearly all applications need to report the amount of time that has elapsed between two events or calculate when a future event should occur.
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