无码中文字幕一Av王,97亚洲综合色成在线,中文字幕无码无遮挡在线看,久久99久久国产精品

A train travels along a bridge of the Qinghai-Tibet Railway above the Chumar River, a source of the Yangtze River, in Golmud, Northwest China's Qinghai Province, June 13, 2007. The landscape, lakes and the frozen earth on the Tibetan Plateau have been well preserved and the wildlife's migration remained unchanged since the world's highest railway was put to use, the State Environmental Protection Administration says in a survey report. [Xinhua]