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signal

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When we turned the boat about, the signal began to bleep again constantly.(我们调转船头的时候，信号器又开始发出不停的嘟嘟声。)
When I give the signal , run!(我一发信号，你就跑！)
The transmitters will send a signal automatically to a local base station.(发射台会自动将信号发送到地方基站。)
You must signal which way you are going to turn.(你要朝哪个方向转，必须发出信号。)
A radio signal was sent to the spacecraft.(向宇宙飞船发出了无线电信号。)
It's a signal that we might need to protect ourselves.(这是我们保护自己可能需要的一个信号。)
The reception was a little faint but clear enough for him to receive the signal.(接收有些弱，但足够清晰到使他能够接收信号。)
The coded signal is received by satellite dishes.(电码信号通过卫星天线接收。)
When the stem dies, its hormone signal also ceases.(当茎死亡时，它的激素信号也停止了。)
A radio signal has both electrical and magnetic properties.(无线电信号既具有电的特性也具有磁的特性。)

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