名词
中文翻译：信号
同义词：
['notice', 'indicator', 'sign', 'indication']
例句：
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1. The traffic lightis a signal for pedestrians to cross the street.
交通灯是行人过马路的信号。
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2. The new policy is a clear signal that the company will invest in renewable energy.
新的政策是公司将投资可再生能源的明确信号。
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3. The policeman's uniform is a symbol of his duty and responsibility.
警察制服是他对职责和责任的象征。