名词
中文翻译：信号
同义词：
['notice', 'indicator', 'indication', 'sign']
例句：
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1. The policeman signaled for the driver to stop.
警察向驾驶员示意停车。
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2. The traffic light is a common signal for pedestrians crossing the street.
交通灯是行人过马路的常见信号。
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3. The doctor gave her a thumbs-up as a signal of approval.
医生向她竖起大拇指作为赞同的信号。