Aerial photo shows a black-necked crane foraging at the foot of Mount Qomolangma in Xigaze City, southwest China's Tibet Autonomous Region, May 17, 2019. The 8,844.43-meter-high Mt. Qomolangma is the world's highest peak. (Photos: Xinhua)

Photo taken on May 18, 2019 shows the scenery of Mount Qomolangma. The 8,844.43-meter-high Mt. Qomolangma is the world's highest peak.

Photo taken on May 18, 2019 shows the scenery of Mount Qomolangma from the base camp in southwest China's Tibet Autonomous Region. The 8,844.43-meter-high Mt. Qomolangma is the world's highest peak.

Photo taken on May 18, 2019 shows the scenery of Mount Qomolangma. The 8,844.43-meter-high Mt. Qomolangma is the world's highest peak.

Photo taken on May 18, 2019 shows the Rongbuk Monastery at the foot of Mount Qomolangma in southwest China's Tibet Autonomous Region. The 8,844.43-meter-high Mt. Qomolangma is the world's highest peak.