用英语介绍自行车，汽车、飞机这三种交通工具。（简单一点是初一英语，不下50个单词）

自行车:bike:This is a kind of vehicles.It has two wheels. 汽车:car:This is a kind of vehicles.It has four wheels. 飞机:plane:This is a kind of vehicles.It can fly. 原文链接：http://shuzhiren.com/post/81961.html