The blue line represents the trunk.

蓝色的线表示主干。

youdao

Our spinal cord is not merely a trunk line transmitting phone calls from the brain. It too thinks.

我们的脊髓不仅仅是传递大脑指令的“电话干线”，它也能思考。

youdao

They receive oil through pipeline gathering systems from production tanks and relay it to trunk line stations.

它们通过管道集油系统从生产罐接受原油，并把它转输到干线泵站。

youdao

The entire second floor is devoted to a major China Telecom trunk line and phone equipment, which cannot be removed.

WSJ: Touring Asia's Art Deco Gems in Shanghai and Napier, New Zealand

The most notable omission is infrastructure construction of a gas gathering system to tie into, with luck, an existing nearby major trunk line.

FORBES: My Prediction Was Wrong: Why We Didn't Get To $8 Natural Gas

Most of those corridors use Texas for a trunk line.

FORBES: Magazine Article