Similarly, high-level events can be decomposed into one or more low-level events or actions; for example, changing a pressure control valve, sounding an alarm, or signaling an alert.
类似地，高层次事件能够被拆分成一个或者多个低层次事件或动作；例如，更换压力控制阀、拉响警报或发出警戒信号。
It can also be a car that has built-in sensors to alert the driver when the tire pressure is low.
它还可以是装有内置传感器的汽车，一旦胎压不足，传感器就会向驾驶员发出警报。
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