名词
中文翻译：信号
同义词：
['notice', 'indicator', 'sign', 'indication', 'cue', 'signal', 'beacon']
例句：
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1. The policeman used his whistle to signal the driver to stop.
警察用哨子示意司机停车。
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2.The car's engine noise is a constant signal of its age.
汽车发动机的噪音是它年龄的一个持续信号。
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3.The new traffic light is a bright red signal that means stop.
新的交通灯是一个明亮的红色信号，表示停止。