名词
中文翻译：两条线
同义词：
['double line', 'dual line']
例句：
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1. The traffic police were directing the double lines of cars.
交通警察正在指挥车辆的双行线。
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2. The double lines on the road indicate the speed limit.
路上的双行线表示限速。
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3. The double lines are used to separate different types of traffic.
双行线用于区分不同类型的交通。