What's more, when people are in danger and there is no mobile phone signal, they can use Beidou to send a 1200-word message to ask for help.

更重要的是，当人们处于危险之中而手机又没有信号时，他们可以使用北斗发送一条1200字的信息寻求帮助。

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Signals are different in that they cannot return anything: there is neither a "signal return" message, nor any other type of error message.

信号的不同之处在于它们不返回任何内容：既没有“信号返回”消息，也没有任何类型的错误消息。

youdao

The interactions are initiated by firing a signal or message that corresponds to some business-domain event.

通过触发对应于某些业务领域事件的信号和消息，来启动交互。

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Just like the dutch coffeehouses, and countless wall street bars, and stock message boards, Twitter is going to have either a low signal to noise ratio if you are being polite, and a lot of BS if you are not.

FORBES: So Much For Mining Twitter Sentiment For Picking Stocks

Because of a bad signal, the Pope's first call didn't come through, so the pontiff left a message.

CNN: The 'cold call' Pope rings again