The role, working principle, structure and commonly used material of steel aluminum composite conductor rail in the three-rail system are introduced.

介绍钢铝复合导电轨在三轨系统中的作用、工作原理、结构和常用材料。

youdao

Transport analysts argue that rail journeys must be around three hours long to be competitive with airline services on the same routes.

运输专家指出，在同样的线路上铁路行程的时间必须控制在3小时左右才能与航空业竞争。

youdao

The local branch of Ivy tech, a community college, agreed to create a three-week welding course to teach the specialised techniques Progress Rail USES.

一所社区大学，也是当地的常青藤科技分院同意针对Progress Rail所需的专业技术，开设为期三周的焊工课程。

youdao

"It includes three hundred million dollars to buy new cars for the government, eight billion dollars for high-speed rail projects, such as a 'magnetic levitation' line from Las Vegas to Disneyland, and one hundred forty million dollars for something called 'volcano monitoring.'

VOA: special.2009.02.27

"At a per-passenger-mile basis, rail is about three times as efficient as travel by car, in terms of fuel efficiency, and six times as efficient as travel by air, so there are pretty substantial pollution reduction benefits both in terms of greenhouse gases and other pollutants."

VOA: standard.2010.02.15

It boasts exclusive equestrian trails and a laid-back lifestyle, complete with white three-rail fences, and no sidewalks or street lights.

FORBES: Hidden Hills, Los Angles County, California

"High-speed rail has three advantages over air travel, " Si Xianmin is reported to have said with refreshing frankness.

ECONOMIST: Business travel

It's now only four and a half hours from Hefei to Shanghai on the newly built highway and less than three by the new high-speed rail link.

NPR: China Seeks Cheaper Labor Within Its Borders