Aerial photo taken on Aug. 9, 2019 shows a herd of yaks on a grassland in Damxung County of southwest China's Tibet Autonomous Region. On the highland pastures in Damxung County in the north of Tibet Autonomous Region, the rainy season arrives in summer with abundant water and grass for the livestock to feed on. The area is a key producer and exporter of dairy and meat products, which generate a vital source of income for the locals. (Xinhua/Purbu Zhaxi)