动词
中文翻译：Unknown
同义词：
['notify', 'signal', 'warn', 'announce']
例句：
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1. The policeman signaled for thedriver to stop.
警察向司机示意停车。
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2.The ship's radio was a constantsource of signals from other ships.
这艘船的无线电是其他船只不断发出的信号源。
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3. The pilot used a flashing lightas a signal to land.
飞行员用闪烁的灯光作为降落的信号。