注意特殊值- 0，正如清单4中的用法一样，它将测试是否可以将某个信号发送到进程。
Note that the special value -0, as used in Listing 4 above, tests whether a signal could be sent to a process.
在这篇文章中清晰信号的作用部分，当你不使用食物或玩具帮助狗儿出任动作时，我会详细说明身体作用信号的用法。
For the purpose of clear communication in this article I will define a signal as the use of your body when your not using food or a toy to help a dog perform a behavior.
串混型SPD是铁路信号系统过电压防护的新用法。
The series mixed SPD is a new method of using for the railroad signal system of over voltage protection.
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