Scheduling is basically a time box method that defines the period of time for an iteration and the requirements that should be completed within that time frame.
计划调度基本上就是一个时间框方法，定义应该完成的交互和需求的时间范围。
A timer is an object that can be set to invoke a method after the specified period of time elapses.
计时器(timer)是一个对象，通过设置计时器，可以在指定时间段过后调用某个方法。
Using the same method, they also ruled out the possibility that the emperor had been poisoned over a long period of time or by taking too much Chinese medicine.
使用同样的方法，他们同样排除了光绪皇帝被长期下毒或者服用过多中药的可能性。
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