URUMQI, June 11, 2016 (Xinhua) -- Frontier guards Zhang Zhiqiang (1st R) and his colleague Aji Maimaiti (1st L) help build a sheep pen for herdsmen of Kirgiz ethnic group in Tajik Autonomous County of Taxkorgan, northwest China's Xinjiang Uygur Autonomous Region, June 6, 2016. Frontier guards helped Kirgiz nomads move to their summer pasture over the border areas of some 4,000 meters above the sea level here in Xinjiang. (Xinhua/Zhao Ge)