名词
中文翻译：信号车牌同义词
同义词：
['license plate', 'license plate number']
例句：
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1. The police officer handed the driver a signal number plate.
警察给司机一个信号车牌。
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2. The car was pulled over by the police for not having a valid signal number plate.
这辆车因为没有有效的信号车牌而被警方拦下。
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3. The driver had to present his signal number plate to the police when he was pulled over.
当这辆车被拦下时，司机必须出示他的信号车牌。