Photo shows swans gamboling in a lake of Gannan Tibetan Autonomous Prefecture, southern Gansu Province, northwest China. (Photo Source: gansudaily.com.cn)

A old Tibetan man turns prayer wheel in Gannan Tibetan Autonomous Prefecture, southern Gansu Province. (Photo Source: gansudaily.com.cn)

A Tibetan woman stands on a hill overlooking her village in Gannan Tibetan Autonomous Prefecture, southern Gansu Province. (Photo Source: gansudaily.com.cn)

A Tibetan family walk at dusk on a countryroad in Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province. (Photo Source: gansudaily.com.cn)

Photo shows a herd of cattle in search of food on a pasture in Gannan Tibetan Autonomous Prefecture, southern Gansu Province. (Photo Source: gansudaily.com.cn)