名词
中文翻译：Unknown
同义词：
['main line', 'standard line', 'general route', 'main road']
例句：
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1. The general line of the railway passes through the city center.
这条铁路的总线路穿过市中心。
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2. The standard line for international shipping is the Suez Canal.
国际航运的标准线路是苏伊士运河。
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3. Main roads are usually wider than side roads, providing a general line of travel.
主干道通常比支路宽，提供一条通行的主线。