动词
中文翻译：信号
同义词：
['notify', 'warn', 'indicate', 'announce', 'signalize']
例句：
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1. The policeman signaled for the driver to stop.
警察向司机示意停车。
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2.The plane's engine signalled a sudden drop in altitude.
飞机的引擎突然降低了高度。
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3. The radio station signalled that there would be a live broadcast.
收音机通知说将有现场直播。