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1美国概况美国位于北美洲中部，国土面积937万km；仅次于俄罗斯、加拿人和中国，居世界第四位；北邻加拿大，西南接墨西哥，陆界长约908Ohm东濒大西洋，西滨太平洋，东南临墨西哥湾，海岸线长约22680km。总人口2．5亿，其中都市人口（超过5000人口以上的都市）为1．9亿，占总人
1 United States profile The United States is located in the central North America, the land area of 9.37 million km; second only to Russia, Canada and China, ranking fourth in the world; north of Canada, southwest of Mexico, the land about 908Ohm east near the Atlantic Ocean, west The Pacific Ocean, southeast of the Gulf of Mexico, the coastline about 22680km. The total population of 250 million, of which the urban population (more than 5000 urban population) is 190 million, accounting for the total