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.


中文翻譯：美國是世界上非常重要的大國,其國土面積位于世界第四位,僅次與俄羅斯、加拿大和中國.美國位于北美洲,鄰國有加拿大和墨西哥等,美國領土還包括瀕臨北冰洋的阿拉斯加和太平洋的夏威夷.美國經濟和科技實力目前在世界無人可以望其項背,是當之無愧的超級大國.
美國的氣候具有多樣化的特點.美國本土所處的緯度大約在北緯25°到49°之間,除佛羅里達半島南端為熱帶氣候外,都為溫帶和亞熱帶氣侯.降水量不平衡,一般說來,東部濕潤,西部干旱.東北部沿海和五大湖地區(qū),受拉布拉多寒流和北方冷空氣影響,冬季寒冷,1月份平均氣溫為-6℃左右,夏季較溫和,多雨,7月份平均氣溫為16℃左右；年平均降水量約1000毫米.中部大平原區(qū),由于地形南北敞開,冬季寒冷氣流可長驅南下,夏季炎熱的南風可不斷吹進,因而冬季寒冷,夏季炎熱.靠近北部一帶,l月份最低氣溫可達-40℃,7月份最高氣溫可達45℃.年平均降水量一般在500～1000毫米.東南部和墨西哥灣沿岸為亞熱帶氣候.受墨西哥灣暖流影響,溫暖濕潤,1月份平均氣溫為9℃左右,7月份平均氣溫為24～27℃.夏末初秋墨西哥灣沿岸常有颶風侵襲,造成災害.年平均降水量在1500毫米以上.西部內陸高原,氣候干燥,冬季寒冷,夏季炎熱,年平均降水量在500毫米以下,高原南部的荒漠地帶降水量不到250毫米.太平洋沿岸北部是海洋性氣候,冬暖夏涼,雨量充沛,l月份平均氣溫在4℃以上,8月份平均氣溫不超過14℃,年平均降水量在1500毫米以上.太平洋沿岸南部屬地中海型氣候,冬季溫暖多雨,夏季干燥悶熱,1月份平均氣溫為12℃,8月份超過22℃,年平均降水量為300～500毫米.阿拉斯加約有1/3位于北極圈內,屬寒帶,氣候干燥寒冷.東南部太平洋沿岸因受阿拉斯加暖流的影響,氣候較溫和濕潤.夏威夷群島地處熱帶,氣候炎熱.一般來說迎風的東北坡降水豐富,背風的西南坡干燥少雨,個別迎風坡年降水量可達12000毫米.
美國國旗為長方形,長寬之比為19：10,為星條旗(the Star-Spangled Banner),旗面左上角為藍色星區(qū),區(qū)內的星數(shù)于有關部門規(guī)定,美國的州數(shù)就是國旗上的星數(shù).星區(qū)以外是13道紅白相間的條紋,13道條紋代表最初北美13塊殖民地.據華盛頓說：紅色條紋象征英國,白色條紋象征脫離它而獲得自由.更普遍的說法認為,紅色象征強大和勇氣,白色象征純潔和清白,藍色則象征警惕,堅韌不拔和正義.1818年美國國會通過法案,國旗上的紅白寬條固定為13道,五角星數(shù)目應與合眾國州數(shù)一致.每增加一個州,國旗上就增加一顆星,一般在新州加入后的第二年7月4日執(zhí)行.至今國旗上已增至50顆星,代表美國的50個州.每年6月14日為“美國國旗制定紀念日”.在這一天,美國各地舉行紀念活動,以示對國旗的敬重和對合眾國的熱愛.