“运输线”用英语怎么说

三条运输线为交易会服务.Three transportation lines will serve the fair.其外层环带还有沟通树冠和树根的运输线.The outer zones are the conducting routes between the crown and the roots.使用铁路运输线的人数在上升,这是个好兆头.One encouraging portent is that more people are...