介绍美国英语

The United States in the North Central and North America also includes the territory of Alaska and the Pacific northwest of the Hawaiian Islands in Central. North and the Canadian border, south through the Gulf of Mexico, west Pacific, East Bin Atlantic. Coastline of 22,680 kilometers. Most areas of continental climate, the southern subtropical climate. Big temperature difference between north-central plains, Chicago January average temperature -3 ℃, 7月24 ℃; Gulf Coast in January the average temperature of 11 ℃, 7月28 ℃. Climate The United States has almost all the world's climate types, in the main agricultural zone in rare severe drought, flooding is not uncommon, and a moderate while the temperature to adequate rainfall. Climate impact on the United States is the main Arctic air, from the Pacific each year bring a large-scale low pressure, these low pressure through the Nevada mountains, the Rocky Mountains and the Cascade range, attach a great deal of moisture, when they arrived at the central pressure Great Plains, will be able to reorganize, leading to the main air masses meet and bring a fierce thunderstorm, especially in the spring and summer. These may sometimes heavy rain and low pressure to join the other, continue to the East Coast and the Atlantic Ocean, and will become more intense storms in the northeast (Nor'easter), in the United States in the Northeast Atlantic region and New England a wide-ranging and heavy snowfall. Great Plains incomparably vast grassland has also developed a number of the world's most extreme climate change phenomenon. 美国位于北美洲中部,领土还包括北美洲西北部的阿拉斯加和太平洋中部的夏威夷群岛.北与加拿大接壤,南靠墨西哥湾,西临太平洋,东濒大西洋.海岸线22680公里.大部分地区属于大陆性气候,南部属亚热带气候.中北部平原温差很大,芝加哥1月平均气温－3℃,7月24℃；墨西哥湾沿岸1月平均气温11℃,7月28℃. 气候 美国几乎有着世界上所有的气候类型,在主要农业地带少有严重的干旱发生、洪水泛滥也并不常见,并且有着温和而又能取得足够降雨量的气温. 影响美国气候的主要是北极气流,每年从太平洋带来了大规模的低气压,这些低气压在通过内华达山脉、洛矶山脉、和喀斯喀特山脉时夹带了大量水分,当这些气压到达中部大平原时便能进行重组,导致主要的气团相遇而带来激烈的大雷雨,尤其是在春季和夏季.有时这些暴雨可能与其他的低气压会合,继续前往东海岸和大西洋,并会演变为更激烈的东北风暴（Nor'easter）,在美国东北的中大西洋区域和新英格兰形成广泛而沉重的降雪.大平原广阔无比的草原也形成了许多世界上最极端的气候转变现象.

Introduction to U.S.A.The United States of America is a federal constitutional republic comprising fifty states and a federal district.The country is situated mostly in central North America,where its forty-eight contiguous states and Washington,D.C.,the capital district,lie between the Pacific and Atlantic Oceans,bordered by Canada to the north and Mexico to the south.The state of Alaska is in the northwest of the continent,with Canada to its east and Russia to the west across the Bering Strait,and the state of Hawaii is in the mid-Pacific.The United States also possesses several territories,or insular areas,scattered around the Caribbean and Pacific.At 3.79 million square miles (9.83 million km²) and with over 300 million people,the United States is the third or fourth largest country by total area,and third largest by land area and by population.The United States is one of the world's most ethnically diverse nations,the product of large-scale immigration from many countries.The U.S.economy is the largest national economy in the world,with a nominal 2006 gross domestic product (GDP) of more than US$13 trillion (over 19% of the world total based on purchasing power parity).The nation was founded by thirteen colonies of Great Britain located along the Atlantic seaboard.Proclaiming themselves "states," they issued the Declaration of Independence on July 4,1776.The rebellious states defeated Great Britain in the American Revolutionary War,the first successful colonial war of independence.A federal convention adopted the current United States Constitution on September 17,1787; its ratification the following year made the states part of a single republic.The Bill of Rights,comprising ten constitutional amendments,was ratified in 1791.In the nineteenth century,the United States acquired land from France,Spain,Great Britain,Mexico,and Russia,and annexed the Republic of Texas and the Republic of Hawaii.Disputes between the agrarian South and industrial North over states' rights and the expansion of the institution of slavery provoked the American Civil War of the 1860s.The North's victory prevented a permanent split of the country and led to the end of slavery in the United States.The Spanish-American War and World War I confirmed the nation's status as a military power.In 1945,the United States emerged from World War II as the first country with nuclear weapons,a permanent member of the United Nations Security Council,and a founding member of NATO.The United States entered the post–Cold War era as the only remaining superpower and a dominant economic,political,and cultural force in the world.美国简介美利坚合众国（英语：United States of America,USA）,简称美国,旧称花旗国,是位于北美洲的联邦共和制国家,也是世界上最为悠久的共和立宪制国家.美国本土东濒大西洋,西临太平洋,北靠加拿大,南接墨西哥及墨西哥湾.首都为华盛顿哥伦比亚特区.美国源自于1776年脱离英国统治的北美殖民地,13州的殖民地代表一同发表了《美国独立宣言》,在经历艰苦的独立战争后,于1783年与英国签订了巴黎协约,从此受到世界各国的承认.经过两百多年的发展,美国国土不断拓展,37个州陆续加入联邦旗下.目前有50个州,1个联邦直辖特区,以及若干海外领地.国土面积超过962万平方公里,国土面积位居世界第三或第四名.美国人口约3亿人,其数量亦为世界第三.美国国旗上的50颗白色星星代表50个州；每当新州加入联邦,次年的7月4日国旗将增加一颗星.国旗上红色及白色横条各7及6条,共13条,纪念最初的13个州.建国200多年以来,美国曾经历过南北战争（1861—65年）和经济大恐慌（1930年代）两次严酷考验[NextPage],仍坚守自由民主制政治制度,成为宪法民主和公民自由的代表性国家.美国庞大的经济、文化、科技、和军事影响力贯穿了整个20世纪.在第一次世界大战和第二次世界大战中,美国和同盟国一同获得胜利,并经历数十年的冷战后终于拖垮苏联,成为世界上唯一的超级大国.当今美国在全世界的经济、政治、军事等众多领域的庞大影响力都是无他国能比的.——转自〈维基百科全书〉