动词
中文翻译：信号
同义词：
['notify', 'signal', 'warn', 'indicate']
例句：
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1.The policeman signaled him to stop.
警察示意他停下。
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2. The car's engine signalled that it was ready to start.
汽车的引擎发出信号，表明它准备好了。
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3.The radio station is sending a signal for the next broadcast.
电台正在发送下一个广播的信号。