Mountain guide Migmar Toinzhub from Himalaya Expedition Co. Ltd poses for a photo at the Mount Qomolangma base camp in southwest China`s Tibet Autonomous Region, May 8, 2020. Participants have been well prepared to ensure the accomplishment of the mission to remeasure the height of Mount Qomolangma. (Xinhua/Purbu Zhaxi)

Doctor Ngawang Norbu poses for a photo at the Mount Qomolangma base camp in southwest China`s Tibet Autonomous Region, May 8, 2020. Participants have been well prepared to ensure the accomplishment of the mission to remeasure the height of Mount Qomolangma. (Xinhua/Purbu Zhaxi)

Surveyors Zheng Lin (L) and Wu Guangwei pose for a group photo at the Mount Qomolangma base camp in southwest China`s Tibet Autonomous Region, May 8, 2020. Participants have been well prepared to ensure the accomplishment of the mission to remeasure the height of Mount Qomolangma. (Xinhua/Jigme Dorje)

Thubten, an employee of the Tibet branch of China Mobile poses for a photo at the Mount Qomolangma base camp in southwest China`s Tibet Autonomous Region, May 8, 2020. Participants have been well prepared to ensure the accomplishment of the mission to remeasure the height of Mount Qomolangma. (Xinhua/Purbu Zhaxi)