名词
中文翻译：信号
同义词：
['notice', 'indicator', 'sign', 'signal', 'indication']
例句：
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1.The traffic policeman gave a signal to stop at the red light.
交通警察在红灯时发出了停止的信号。
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2.The new product has a clear signal for consumers.
新产品对消费者有明确的信号指示。
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3.The ship's horn is a common signal for distress.
船的汽笛是常见的求救信号。