它们接到了干线上。They plug into the mains.在干线公路上,交通往往十分拥挤.Vehicles often bunches on the big highways.铁道干线直达飞机场.The railway line comes to the airport....

“干线”的拼音为：gān xiàn...

“干线”的英语可以翻译为：dryline...