As a general rule, anywhere constants are in use, such as in places you are currently using the switch code to switch constants.
一条普遍规则是，任何使用常量的地方，例如目前用switch代码切换常量的地方。
You switch on your PC, you travel to websites without taking a train, to London or anywhere.
你打开你的电脑，你旅行在各网站不用乘火车，到伦敦或任何地方。
The leaking could come from anywhere in the system, from tubing to an accumulator to a tiny pressure switch gone bad.
泄漏可能源自系统的任何地方，如管道，累加器，还有坏掉的一个小压力开关。
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