名词
中文翻译：信号
同义词：
['sign', 'indicator', 'cue']
例句：
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1. The policemen used a flashlightto signal the driver to stop.
警察用手电筒向司机示意停车。
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2. Thepilot gave a hand signal to indicate thathe was ready for takeoff.
飞行员做了一个手势表示他准备好起飞了。
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3. The gameended with a sudden signal from the referee.
比赛在裁判的一个突然信号后结束。