皮肤过敏症状出现或者加重时停止使用。
我起初不明白为何，但很快我得知电力供应短缺，便关掉空调午夜时停止使用。
I didn't understand why at first, but soon I learned that there is a great shortage of electricity supply in our city-my air-conditioner turned off because of a power failure midnight.
我们也可以设定低一点的值，例如30%的利用率时停止使用检查点方法的刷新内存页，这能避免无谓的IO。
We could also have low water value, ie 30% utilized at which we can stop checkpoint kind flushes, which would avoid uneeded IO.
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