名词
中文翻译：路标
同义词：
['sign', 'signpost', 'road sign']
例句：
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1. The driver couldn't find the turn, so he stopped at a road sign.
司机找不到转弯处，所以他停在了一个路牌前。
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2. The policeman was directing traffic at the busy intersection.
警察在繁忙的十字路口指挥交通。
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3. The old man pointed to the road sign as he walked down the street.
老人沿着街道行走时指着路牌。