用一段英语文章来描述美国的地理位置,天气和国旗.

The United States is the world's very important big country, its land area is located in the fourth in the world, behind Russia, Canada and China. The United States is located in North America, neighboring countries such as Canada and Mexico have, the United States also includes the verge of the Arctic territory of Alaska and Hawaii Pacific. The United States economic and technological power in the world no one can challenge, are well-deserved superpower.
The United States with the diverse nature of the climate. In which the United States in the north latitude of approximately 25 ° to 49 ° between, with the exception of the southern tip of Florida peninsula as a tropical climate, are for the temperate and subtropical climate. Uneven precipitation, generally speaking, the east and humid, arid western region. North-eastern coastal and Great Lakes regions, the north by the cold Labrador and the impact of the cold, cold winter, the average January temperature of about -6 ℃ in summer than mild, wet, the average July temperature of 16 ℃ or so; annual average about 1000 mm of precipitation. The central Great Plains area, north and south because of the terrain open, the cold winter air can be south, the summer can be hot southerly blowing constantly, and the winter cold and summer heat. The area around the northern, l up to the month of minimum temperature of -40 ℃, 7 month up to a maximum temperature of 45 ℃. The annual average precipitation is normally 500 to 1000 mm. South-east and the Gulf of Mexico coast to subtropical climate. Affected by the Gulf Stream, warm and humid, the average January temperature of 9 ℃ around the average July temperature of 24 ~ 27 ℃. Often in late summer early autumn hurricane hit the Gulf Coast, resulting in disaster. The annual average precipitation 1500 mm. Western inland plateau, the climate is arid with cold winter, hot summer, the annual average precipitation at 500 mm below the southern desert plateau less than 250 mm of precipitation. The Pacific coast of the northern part of the climate,rainfall, l the average temperature in the month of more than 4 ℃, the average temperature in August do not exceed 14 ℃, the average annual precipitation 1500 mm. Pacific Rim is the southern Mediterranean-type climate, warm and rainy winter, dry hot summer, the average January temperature of 12 ℃, 8 month more than 22 ℃, the average annual precipitation is 300 ~ 500 mm. Alaska, about 1 / 3 is located in the Arctic Circle, is a cold, dry and cold climate. Southeastern Alaska along the Pacific coast due to the impact of warm, humid climate more moderate. Hawaiian Islands is located in tropical, hot climate. In general the wind-rich precipitation in the north-east slope, leeward drier dry southwest slope, the slope of individual wind of up to 12,000 millimeters of annual precipitation.
American flag for a rectangular shape, length and width ratio of 19:10 for the Stars and Stripes (the Star-Spangled Banner), the upper-left corner flag for the blue stars surface area of the stars a few provisions in the respective departments, the United States is the state flag on the number of a few of the stars. Star 13 is outside the red and white stripes, 13 stripes on behalf of the original 13 colonies in North America. According to Washington, said: symbol of the United Kingdom with red stripes, white stripes and a symbol of freedom from it. More general argument that the red symbol of strength and courage, a symbol of purity and innocence of white, blue is a symbol of vigilance, perseverance and justice. In 1818 the U.S. Congress pass the bill, red and white flag on the fixed width for the 13, the number of five-pointed star should be in line with several states of America. Each additional state, the national flag on a star to increase, the general in the new states to join the second year after the implementation of July 4. So far has been the national flag to 50 stars, representing the 50 U.S. states. June 14 each year as "the development of the anniversary of the American flag." On this day, commemorative activities held throughout the United States to show respect for the flag and love of America.


中文翻译：美国是世界上非常重要的大国,其国土面积位于世界第四位,仅次与俄罗斯、加拿大和中国.美国位于北美洲,邻国有加拿大和墨西哥等,美国领土还包括濒临北冰洋的阿拉斯加和太平洋的夏威夷.美国经济和科技实力目前在世界无人可以望其项背,是当之无愧的超级大国.
美国的气候具有多样化的特点.美国本土所处的纬度大约在北纬25°到49°之间,除佛罗里达半岛南端为热带气候外,都为温带和亚热带气侯.降水量不平衡,一般说来,东部湿润,西部干旱.东北部沿海和五大湖地区,受拉布拉多寒流和北方冷空气影响,冬季寒冷,1月份平均气温为-6℃左右,夏季较温和,多雨,7月份平均气温为16℃左右；年平均降水量约1000毫米.中部大平原区,由于地形南北敞开,冬季寒冷气流可长驱南下,夏季炎热的南风可不断吹进,因而冬季寒冷,夏季炎热.靠近北部一带,l月份最低气温可达-40℃,7月份最高气温可达45℃.年平均降水量一般在500～1000毫米.东南部和墨西哥湾沿岸为亚热带气候.受墨西哥湾暖流影响,温暖湿润,1月份平均气温为9℃左右,7月份平均气温为24～27℃.夏末初秋墨西哥湾沿岸常有飓风侵袭,造成灾害.年平均降水量在1500毫米以上.西部内陆高原,气候干燥,冬季寒冷,夏季炎热,年平均降水量在500毫米以下,高原南部的荒漠地带降水量不到250毫米.太平洋沿岸北部是海洋性气候,冬暖夏凉,雨量充沛,l月份平均气温在4℃以上,8月份平均气温不超过14℃,年平均降水量在1500毫米以上.太平洋沿岸南部属地中海型气候,冬季温暖多雨,夏季干燥闷热,1月份平均气温为12℃,8月份超过22℃,年平均降水量为300～500毫米.阿拉斯加约有1/3位于北极圈内,属寒带,气候干燥寒冷.东南部太平洋沿岸因受阿拉斯加暖流的影响,气候较温和湿润.夏威夷群岛地处热带,气候炎热.一般来说迎风的东北坡降水丰富,背风的西南坡干燥少雨,个别迎风坡年降水量可达12000毫米.
美国国旗为长方形,长宽之比为19：10,为星条旗(the Star-Spangled Banner),旗面左上角为蓝色星区,区内的星数于有关部门规定,美国的州数就是国旗上的星数.星区以外是13道红白相间的条纹,13道条纹代表最初北美13块殖民地.据华盛顿说：红色条纹象征英国,白色条纹象征脱离它而获得*.更普遍的说法认为,红色象征强大和勇气,白色象征纯洁和清白,蓝色则象征警惕,坚韧不拔和正义.1818年美国国会通过法案,国旗上的红白宽条固定为13道,五角星数目应与合众国州数一致.每增加一个州,国旗上就增加一颗星,一般在新州加入后的第二年7月4日执行.至今国旗上已增至50颗星,代表美国的50个州.每年6月14日为“美国国旗制定纪念日”.在这一天,美国各地举行纪念活动,以示对国旗的敬重和对合众国的热爱.