Villagers attend a spring ploughing ceremony in Jiaru Village, Gurong Town, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Chogo)

Villagers attend a spring ploughing ceremony in Xierong Village, Quxu County, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Purbu Zhaxi)

A farmer attends a spring ploughing ceremony in Xierong Village, Quxu County, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Jigme Dorje)

A villager spreads seeds during a spring ploughing ceremony in Jiaru Village, Gurong Town, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Chogo)

A villager attends a spring ploughing ceremony in Jiaru Village, Gurong Town, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Chogo)

Villagers attend a spring ploughing ceremony in Tanggar Town, Dagze District of Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Zhang Rufeng)

A villager attends a spring ploughing ceremony in Jiaru Village, Gurong Town, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Chogo)

Villagers attend a spring ploughing ceremony in Xierong Village, Quxu County, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Purbu Zhaxi)

Villagers attend a spring ploughing ceremony in Xierong Village, Quxu County, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Purbu Zhaxi)

Villagers attend a spring ploughing ceremony in Jiaru Village, Gurong Town, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Zhan Yan)

Aerial photo shows villagers attending a spring ploughing ceremony in Xierong Village, Quxu County, Lhasa, southwest China's Tibet Autonomous Region, March 16, 2020. Traditional spring ploughing ceremonies took place in Tibet's major cultivation areas on Monday to pray for a year with good harvests. (Xinhua/Jigme Dorje)