main line

US /ˈmeɪn ˌlaɪn/
UK /ˈmeɪn ˌlaɪn/
"main line" picture
1.

主线

a principal railway line

:
The express train runs on the main line.
特快列车在主线上运行。
Repairs to the main line caused significant delays.
主线维修导致严重延误。
2.

主管道, 主线

a principal pipeline or conduit for water, gas, or electricity

:
A burst main line caused a widespread power outage.
主线爆裂导致大面积停电。
The city is upgrading its water main lines.
该市正在升级其供水主管道
3.

主线, 核心

the most important or essential part of something

:
Let's get to the main line of the argument.
让我们切入论点的主线
The main line of his research focuses on climate change.
他研究的主线集中在气候变化上。