Photo taken on May 13, 2020 shows a flock of sheep in Pasum Village at the foot of Mount Qomolangma, in southwest China's Tibet Autonomous Region. Mount Qomolangma National Nature Reserve was set up in 1988. Covering an area of more than 33,800 square km, it is home to one of the world's most vulnerable ecosystems. (Xinhua/Sun Fei)
