名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon']
例句：
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1.The traffic policeman used his flashlight to signal the driver to stop.
交通警察用他的手电筒示意司机停车。
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2. The ship's bell is a signal for the crew to come on deck.
船的钟声是船员上甲板的提示。
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3.The pilot waved his hand as he signaled the plane to land.
飞行员挥手示意飞机降落。