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Aerial photo taken on Sept. 19, 2017 shows the scenery of Guanegou National Forest Park at Dangchang County in Longnan City, northwest China's Gansu Province. (Xinhua/Liu Chan)
Aerial photo taken on Sept. 19, 2017 shows the scenery of Guanegou National Forest Park at Dangchang County in Longnan City, northwest China's Gansu Province. (Xinhua/Liu Chan)