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A signal is an event, and it's used to alert a process.
信号是一个事件，它被用来向某个进程发出警报。
youdao
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The alert is only a signal to begin an investigation.
警戒只是启动调查的一个信号。
youdao
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When we are driving, and we see red signal, we often are more alert.
当我们开车，看到红色的信号时，总会提高警觉。
youdao
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It's the alert signal.
这是警报信号。
youdao
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It's the alert signal.
这是警报信号。
youdao