China's Tibet Autonomous Region is situated on the main body of the Qinghai-Tibet Plateau. With high altitude, unique geographical features and rich wildlife, water and mineral resources, it has been called the ""Roof of the World"" and the ""Third Pole of the Earth."" It is not only the ""source of rivers"" and the ""ecological source"" for the areas in South and Southeast Asia, but is also the ""starter"" and ""regulating area"" of the climate of China and indeed of the Eastern Hemisphere as a whole.中国西藏自治区位于青藏高原的主体，地势高峻，地理特殊，野生动植物资源、水资源和矿产资源丰富，素有“世界屋脊”和“地球第三极”之称。这里不仅是南亚、东南亚地区的“江河源”和“生态源”，还是中国乃至东半球气候的