我们污染了空气

　　清洁的空气对于健康是至关重要。空气中含有杂质，这些杂质会被我们的身体吸收，使人生病。我们需要清洁的空气，但不幸的是，目前普遍存在着空气污染，尤其是在城市里。

　　城市里有许多食品厂、服装厂和制造其它东西的工厂。每天这些工厂把千百万吨烟灰排入空气中。燃煤的工厂也大大加重了空气污染。

　　工厂产生的东西过一个时期就会损坏，然后就作为垃圾扔掉。我们烧掉许多垃圾，烟灰就增多了。还有工厂制造的汽车。汽车一旦出厂在街上行驶，将会吸进空气，排出有毒的气体，并增加空气中的烟尘。

　　世界上还没有一个彻底摆脱了空气污染的地区。我们必须采取些措施来控制空气污染。

　　现在越来越多的人认识到清洁的空气的重要性。学校正在把有关污染的问题纳入教学内容。企业界在帮着净化空气，他们安装了特别的设备来清除烟雾。科学家和发明家们正在努力开发更加清洁的汽车和火车引擎，终有一天我们会驾驶着电力汽车，会有一种新型的纸，在水里溶化而不需要燃烧。一些国家正在开发研制一种新型的、会在阳光下溶化和消失的玻璃瓶。

　　或许，人们在城市里能呼吸新鲜空气的日子将会到来。

　　答案

　　We Have Polluted the Air

　　Clean air is important to good health. If the air contains impurities, they may be absorbed by our bodies and make us ill. We need clean air, but unfortunately, air pollution is generally present, especially in cities.

　　Our cities have many factories, which we need to make food products, clothing and many other things. Every day these factories pour millions upon millions of tons of smoke and soot into the air. Power plants that burn coal add greatly to air pollution.

　　Things made in factories wear out after a while and are thrown away as trash. We burn a lot of trash which produces more smoke and soot. And then there are the cars made in factories. Once they are out on the street, the car will take in air and replace it with poisonous gases which again produce more smoke and soot.

　　No area in the world is completely free of air pollution. We must take measures to control it.

　　Now, more and more people are realizing the importance of clean air. Schools are now teaching about the pollution problem. Industries are beginning to help to clean up, by installing equipment to clean up their smoke. Scientists and inventors are trying to develop cleaner engines for cars and trains; someday we will drive cars with electricity. A new kind of paper that will dissolve in water, and does not need to be burned. A new kind of glass bottle that will melt in sunlight and disappear is being developed in some countries.

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