名词
中文翻译：信号
同义词：
['notice', 'indicator', 'sign', 'signal light']
例句：
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1. Thepoliceman used his flashlight to signal the driver to stop.
警察用他的手电筒示意司机停车。
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2. A red flag is a common signal for stopping or warning.
红旗是停止或警告的常见信号。
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3. The traffic officer waved his hand as a signal to slow down.
交通警察挥手示意减速。