18学年高中英语Unit4Publictranspor单元小结课件牛津译林版选修7

Public transport refers to buses, minibuses, trams, trains, cabs, ferries, airplanes ect. Most of them have their own routes and time tables to pick up and drop off people. Unfortunately, as the growth of people in cities becomes unbelievable, many problems arise. For example, people often can not be conveyed punctually. As a result, subways came into being in metropolis to avoid crashes and to reduce loads on the gr通指公共汽车、小型公共汽车、电车、火车、出租车、 渡船和飞机等。它们大多有自己的路线和乘客上下车的时刻表。 不幸的是，由于城市人口增长变得让人难以置信，很多问题产生 了。例如，人们经常不能准时地被运送。因此，为了避免地面上 的碰撞和减轻负担，地铁在大都市产生了。
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