Photo taken on April 22, 2020 shows highland barley seeds which villagers are sowing in the fields in Chabalang Village of Quxu County in Lhasa, southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Villagers sow highland barley seeds in the fields with agricultural machinery in Chabalang Village of Quxu County in Lhasa, southwest China's Tibet Autonomous Region, April 22, 2020. (Xinhua/Purbu Zhaxi)

Aerial photo taken on April 22, 2020 shows villagers sowing highland barley seeds with agricultural machinery in the fields in Chabalang Village of Quxu County in Lhasa, capital of southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

A villager sows highland barley seeds in the fields with agricultural machinery in Chabalang Village of Quxu County in Lhasa, southwest China's Tibet Autonomous Region, April 22, 2020. (Xinhua/Purbu Zhaxi)

Aerial photo taken on April 22, 2020 shows villagers sowing highland barley seeds agricultural machinery in the fields in Chabalang Village of Quxu County in Lhasa, capital of southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)