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随着社会的发展,汽车在经济领域和社会生活中都占居着越来越重要的地位,并以此来衡量一个国家或地区的经济实力。全世界大约拥有55亿辆汽车,其中大多是小汽车和轻型货车,其平均使用寿命在12年左右,每年报废的车辆大约有3亿辆。汽车大多是由钢铁构成,每辆车含钢铁约1吨。另外一种最常用的金属是铝,每辆车约有30公斤,同时还有一定量的铅、铜和锌。非金属材料包括塑料、玻璃和橡胶。如果是1990年以后生产的车,钢铁所占比例减少,塑料比例增加,并含有50公斤的铝和少量锌。汽车的回收利用率很高,已超过90％,每年可以从中回收钢约2500万吨、铝750000吨。到公元2000年,
With the development of society, automobiles occupy an increasingly important position in both economic and social life, and thus measure the economic strength of a country or region. There are about 5.5 billion vehicles in the world, mostly cars and light trucks, with an average service life of about 12 years and about 300 million vehicles scrapped each year. Most cars are made of steel, each car containing about 1 ton of steel. The other most commonly used metal is aluminum, about 30 kg per car, along with a certain amount of lead, copper and zinc. Non-metallic materials include plastic, glass and rubber. In the case of cars produced after 1990, the share of steel decreased, the proportion of plastic increased, and contained 50 kg of aluminum and a small amount of zinc. The recycling rate of automobiles is very high, exceeding 90%, and can recover about 25 million tons of steel and 750000 tons of aluminum each year. By the year 2000,