A herdswoman milks sheep in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region, Aug. 4, 2019. Summer is a milking season for ewes in the Tibetan pasturing area. Herdsmen here chain up ewes one by one while milking them with buckets in order, a traditional milking way followed by local herdsmen for almost 1,000 years. As an important livestock breeding area in Tibet, Ngari prefecture provides butter, yogurt, beef and mutton to other parts of Tibet. (Xinhua/Jigme Dorje)

Sheep are seen in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region, Aug. 4, 2019. Summer is a milking season for ewes in the Tibetan pasturing area. Herdsmen here chain up ewes one by one while milking them with buckets in order, a traditional milking way followed by local herdsmen for almost 1,000 years. As an important livestock breeding area in Tibet, Ngari prefecture provides butter, yogurt, beef and mutton to other parts of Tibet. (Xinhua/Jigme Dorje)

A herdswoman milks sheep in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region, Aug. 4, 2019. Summer is a milking season for ewes in the Tibetan pasturing area. Herdsmen here chain up ewes one by one while milking them with buckets in order, a traditional milking way followed by local herdsmen for almost 1,000 years. As an important livestock breeding area in Tibet, Ngari prefecture provides butter, yogurt, beef and mutton to other parts of Tibet. (Xinhua/Jigme Dorje)

A herdswoman milks sheep in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region, Aug. 4, 2019. Summer is a milking season for ewes in the Tibetan pasturing area. Herdsmen here chain up ewes one by one while milking them with buckets in order, a traditional milking way followed by local herdsmen for almost 1,000 years. As an important livestock breeding area in Tibet, Ngari prefecture provides butter, yogurt, beef and mutton to other parts of Tibet. (Xinhua/Jigme Dorje)

Sheep are seen in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region, Aug. 4, 2019. Summer is a milking season for ewes in the Tibetan pasturing area. Herdsmen here chain up ewes one by one while milking them with buckets in order, a traditional milking way followed by local herdsmen for almost 1,000 years. As an important livestock breeding area in Tibet, Ngari prefecture provides butter, yogurt, beef and mutton to other parts of Tibet. (Xinhua/Jigme Dorje)

Herdsmen milk sheep in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region, Aug. 4, 2019. Summer is a milking season for ewes in the Tibetan pasturing area. Herdsmen here chain up ewes one by one while milking them with buckets in order, a traditional milking way followed by local herdsmen for almost 1,000 years. As an important livestock breeding area in Tibet, Ngari prefecture provides butter, yogurt, beef and mutton to other parts of Tibet. (Xinhua/Jigme Dorje)

A herdswoman milks sheep in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region, Aug. 4, 2019. Summer is a milking season for ewes in the Tibetan pasturing area. Herdsmen here chain up ewes one by one while milking them with buckets in order, a traditional milking way followed by local herdsmen for almost 1,000 years. As an important livestock breeding area in Tibet, Ngari prefecture provides butter, yogurt, beef and mutton to other parts of Tibet. (Xinhua/Jigme Dorje)

Herdsmen milk sheep in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region, Aug. 4, 2019. Summer is a milking season for ewes in the Tibetan pasturing area. Herdsmen here chain up ewes one by one while milking them with buckets in order, a traditional milking way followed by local herdsmen for almost 1,000 years. As an important livestock breeding area in Tibet, Ngari prefecture provides butter, yogurt, beef and mutton to other parts of Tibet. (Xinhua/Jigme Dorje)

Hundreds of sheep are gathered for milking in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region, Aug. 4, 2019. Summer is a milking season for ewes in the Tibetan pasturing area. Herdsmen here chain up ewes one by one while milking them with buckets in order, a traditional milking way followed by local herdsmen for almost 1,000 years. As an important livestock breeding area in Tibet, Ngari prefecture provides butter, yogurt, beef and mutton to other parts of Tibet. (Xinhua/Jigme Dorje)