You try to give off signals.

你可以试试发出信号。

An alarm went off signaling that their left engine had quit working.

警报响起，飞机左引擎已经停止工作。

This natural show of emotion gives off signals that we are happy, we find something humorous or even that we're just a barrel of laughs!

这种自然的情感表现会发出信号，表明我们很开心，我们发现了一些幽默的东西，甚至我们只是一桶笑声！

And they...and if you turn on a signal, you can make a drug come out when you turn that signal on, and if you turn the signal off, it'll stop.

而且这些芯片… … 如果你开启一个信号，你可以让药物在你开启这个信号的时候释放出来，如果你关掉这个信号，释放就会停止。