现在他们都住在木屋里，不能打电话给家人和朋友因为这里没有信号。
Now they are living in wooden bungalows. They cannot call their families and friends because in this place there is no coverage.
信号也可以将任何数据传送到它们所连接的插槽，尽管在这里我们没有显示这样的示例。
Note that signals can also carry any data to the slots they are connected to, even though we don't show examples of that here.
如果没有查看信号规范，那么这里稍作说明：SIGTERM是默认信号。
If you omit the signal specification, then SIGTERM is the default signal.
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