这将允许线程在没有消息到达的情况下停止等待，查看标志，看看是否应该坚持等待消息。
This allows the thread to stop waiting if no messages have arrived, and check a flag to see if we should keep waiting for messages.
我觉得如果有一天我停止清扫盥洗室，那将是一个不好的标志，我得让自己越走越远，直到我完全绝望。
I feel if I stopped cleaning the toilet one day it would be a bad sign, and I'd let myself go more and more till I was desperate.
它非常醒目，这就是为什么停止标志、停车灯及消防设备通常都漆成红色的原因。
It has very high visibility, which is why stop signs, stoplights, and fire equipment are usually painted red.
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