ingle ticket, a city with a long history, a quiet village, a three-day tour, an experienced guide, beijing 2008 olympic games, beautiful scenery, in peak tourist seasons, natural attraction, on one’s way to france, on the back way , one of the great wonders of the world, spend one’s holidays on the sea , the 11th asian games, travel agency, the tour route, the inner-ring road, travel to england, the great wall , the summer place , zhongshan park , etc. 

　　(6)环境保护

　　a good environment, area pollution, air pollution, air quality standard, antarctic circle, atmospheric chemistry, a heavy rain, a heavy snow, be polluted, be hot, be cold, be cool, be cloudy, be rainy, be sunny, be flooded, climate, carbon dioxide(co2), chemical change, chemical cleaning of coal, climate change, dirty, drought, dry, flood, early warning system, environmental behavior, environmental quality, feel comfortable, global warming, minus 20 degrees centigrade(-20°), 30 degrees above zero(30°)，sea l

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