n.运输；运输工具；运输系统
The Panama Canal has played a very important role in transportation. 巴拿马运河在运输上起到了非常重要的作用。
The railroad gives free transportation for a certain amount of baggage. 铁路免费运送的行李是有一定数量的。
The train is a safe means of transportation. 火车是一种安全可靠的交通工具。
