名词
中文翻译：信号
同义词：
['sign', 'indicator', 'beacon']
例句：
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1.The policeman used his whistle to signal the traffic to stop.
警察用哨子示意交通停车。
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2. The ship's flag is a symbol of its nationality.
船旗是其国籍的象征。
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3. The new sign was put up to indicate the entrance to the museum.
新的标志被挂起以指示博物馆的入口。