自行车

还没有自行车的时候，人们都是步行和骑马。步行很不方便，一小时只能走三、四千米，还累得满头大汗，筋疲力尽。骑马也不方便，最不方便就是要养马、割草，浪费很多时间。

Before bicycles, people were walking and riding. It's very inconvenient to walk. You can only walk three or four thousand meters an hour. You're tired and sweaty and exhausted. It's also inconvenient to ride a horse. The most inconvenient thing is to raise a horse and cut grass, which wastes a lot of time.

随着科学的发展，人们发明了自行车，这车又便宜、又美观、又方便。它是钢管做成的，像一只山羊涂上了五颜六色的油漆，美丽极了！这车子骑上去非常方便，只要你手扶龙头脚踩踏板，车子就能带着人奔跑，一小时能走二 十千米 左右，能给人们减少很多疲劳，又节省时间，因此很受人们欢迎！

随着科学再发展，人们发明了更先进的交通工具有、摩托车、电动车、汽车、火车、飞机、轮船……真是天上飞的，路上跑的，水面行的，人们再也不要为出行烦恼和劳累。

With the development of science, people have invented more advanced means of transportation, such as motorcycles, electric cars, cars, trains, airplanes, ships It's like flying in the sky, running on the road, and walking on the water. People should never worry and work hard for going out.