Road signs are installed to warn tourists not to enter the core zone of Mount Qomolangma National Nature Reserve in China's Tibet Autonomous Region, a move to better conserve the environment of the world's highest mountain, April 6, 2019. (Photo/Xinhua)
A tourist poses for a photo at the foot of the Mount Qomolangma in Southwest China’s Tibet Autonomous Region, April 6, 2019.(Photo/Xinhua)