世界上汽排气污染毕业论文外文翻译.doc

外文原文 Automobile Exhaust Pollution In the world Background When we stand in the street and face the heavy traffic in big cities, some people will be attracted by the prosperity of the city while some will be addicted into the scene of debauchery. We will not realize the danger of exhaust of automobiles until we wake up. It is threatening our lungs and our health. According to the research, in the world, another most important factor, which leads to air pollution, is exhaust of automobiles. In 1943, in Los Angeles of California, USA, 2.5 million cars burnt 1100tons petroleum every day. Petroleum burning brought hydrocarbon. When hydrocarbon was irradiated by ultraviolet radiation of sunlight, it had chemical changes. There had been light blue fog. The fog made a lot of citizens become sick, such as red eyes and pain in the head. From then on, people call this pollution actinic fog. In 1955 and 1970, actinic fog event happened twice in Los Angeles. The former made four hundred people died of breath crock up. Three-fourths of the citizens got sick in 1970. In history, actinic fog events in Los Angeles were called one of “The world eight threaten” and “The ten environmental threaten in 20th century” in the world. These events make people start to realize threaten of exhaust of automobiles. A lot of environmental protectors are worried about the danger of our living environment. Introduction Automobiles are the necessary products of the development of modern industry civilization. Its agility and convenience satisfy the demand of people to improve the level of life very well. It improves the development of traffic. What’s more, automobile also becomes the top industry in some countries. It improves the development of social economy consider from some degree. As the old saying goes, “Fire and water are good servants, but bad masters”. Since 21st century, automobile exhaust pollution is becoming a global problem. The demand of automobiles is increasing every day. With t