Aerial photo taken on May 29, 2020 shows a view of Litang County at an altitude of about 4,000 meters in southwest China's Sichuan Province. (Xinhua/Li Mengxin)

Aerial photo taken on May 29, 2020 shows a view of Litang County at an altitude of about 4,000 meters in southwest China's Sichuan Province. (Xinhua/Li Mengxin)

Aerial photo taken on May 29, 2020 shows a view of Litang County at an altitude of about 4,000 meters in southwest China's Sichuan Province. (Xinhua/Li Mengxin)

Aerial photo taken on May 29, 2020 shows a view of Litang County at an altitude of about 4,000 meters in southwest China's Sichuan Province. (Xinhua/Li Mengxin)

Aerial photo taken on May 29, 2020 shows a view of Litang County at an altitude of about 4,000 meters in southwest China's Sichuan Province. (Xinhua/Li Mengxin)

Aerial photo taken on May 29, 2020 shows a view of Litang County at an altitude of about 4,000 meters in southwest China's Sichuan Province. (Xinhua/Li Mengxin)

Aerial photo taken on May 29, 2020 shows a view of Litang County at an altitude of about 4,000 meters in southwest China's Sichuan Province. (Xinhua/Li Mengxin)

Aerial photo taken on May 29, 2020 shows a view of Litang County at an altitude of about 4,000 meters in southwest China's Sichuan Province. (Xinhua/Li Mengxin)