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用一段英语来简述美国地理,

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用一段英语来简述美国地理,
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.