干线

The railway line comes to the airport.

铁道线直达飞。

The Trans-Canada highway is a federal responsibility.

跨加拿大的交通线是由邦政府管理的。

This is the place where the three main arteries of West London traffic met.

这就是伦敦西部三条主要交通线的交汇处。

Vehicles often bunches on the big highways.

在线公路上, 交通往往十分拥挤。