动词
中文翻译：信号
同义词：
['announce', 'notify', 'indicate', 'signal', 'send a message']
例句：
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1. The policemansignaled to the driver to stop.
警察向司机示意停车。
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2. The radio station sent a signal to its listeners.
电台向其听众发送了信号。
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3. He signaled for help by waving his arms.
他通过挥舞手臂来示意求助。