If you've ever done any event-driven programming in the past, I think you'll find signals to be a refreshing change from the common practice of setting up an explicit event processing loop.

如果您过去曾经编写过事件驱动的程序，那么我认为您会发现，对于设置显式事件处理循环这一常见做法，使用信号是一个令人耳目一新的变化。

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The most common tasks when dealing with signals is to clean up temporary files.

在处理信号时，最常见的任务是清除临时文件。

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A common concern about base station and local wireless network antennas relates to the possible long-term health effects that whole-body exposure to the RF signals may have.

基台和无线局域网络天线方面通常令人关注的一个问题涉及整个人体接触射频信号可造成的长期健康影响。

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Blue may be a common favorite color because it signals such positive things as clear skies, he says.

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Busy signals while trying to get online were as common as the frustration of reaching a human being at the company, despite the blanketing of the nation with free AOL installation CDs in every magazine and at every convenience store.

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The unexpected study is to check for a common but deadly side effect called QT prolongation, in which the electrical signals that cause the heart to beat are drawn out.

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