生活中,我们会遇到形形色色的橡胶制品:扎小辫儿的皮筋,去铅笔迹的橡皮擦,上体育课用的篮球、足球,以及球鞋,雨靴,软管,轮胎……它们最大的特点是富有弹性。人们对橡胶感兴趣,正是看中了它的弹性。最早的自行车装的是木轮子,骑起来颠簸得厉害。自从发现橡胶以后,人们在木轮的外 In life, we will encounter a wide variety of rubber products: rubber bands for children, pencil erasers, basketball and football for physical education, and shoes, boots, hoses, and tires. Their biggest feature is Flexible. People are interested in rubber, it is to look at its flexibility. The earliest bikes were loaded with wooden wheels, and the ride was bumpy. Since the discovery of rubber, people have been outside the wooden wheel