主要线用英语怎么说

"Main line" is a term that is used to refer to a primary railway line or a major transportation route. The term "main line" can also be used to refer to a primary electricity transmission line or a principal pipeline.
The term "main line" originates from the transportation industry, where it is used to describe the primary route of a railway or other transportation system. This route is typically the most direct and efficient way to travel between two points, and it is often used by the majority of passengers or goods being transported.
Here are a few examples of how "main line" can be used in sentences:
The train will depart from the main line station at 8:00am.
The main line of the subway system runs through the city center.
The company is planning to build a new main line pipeline to transport oil from the fields to the refinery.
In Chinese, "主要线" is a good translation for "main line." 例句：
火车将于上午8点从主要线车站出发。
地铁系统的主要线经过市中心。
公司计划建造一条新的主要线管道，从油田运输石油到炼油厂。