名词
中文翻译：主干线
同义词：
['main line', 'main trunk', 'main route']
例句：
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1.The railway has two principal windings running through the city.
这条铁路穿过城市，有两条主要线路。
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2. The company's main road is the principal winding of the highway.
该公司的主要道路是高速公路的主干线。
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3.The engineer carefully inspected the principal windings of the cable.
工程师仔细检查了电缆的主干线。