名词
中文翻译：标志
同义词：
['token', 'signpost']
例句：
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1. The policeman used his baton to signal the traffic to stop.
警察用警棍示意交通停止。
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2. The new policy has been a clear sign of change.
新政策是明显的变化信号。
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3. They exchanged signs with each other as they walked through the tunnel.
他们穿过隧道时互相交换了信号。