动词
中文翻译：信号
同义词：
['notify', 'indicate', 'proclaim', 'announce', 'signalize']
例句：
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1. The policeman waved his hand to signal the driver to stop.
警察挥动手示意司机停车。
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2. The pilot signaled the plane to land before it touched down.
飞行员在飞机着陆前发出了降落的信号。
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3.The traffic light signals when to turn left or right.
交通灯指示左转或右转。