干线

The railway line comes to the airport.

铁道直达飞机场。

The Trans-Canada highway is a federal responsibility.

横跨加拿大是由联邦政府管理。

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

这就是伦敦西部三条主汇处。

Vehicles often bunches on the big highways.

在公路上, 往往十分拥挤。