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A helicopter carries relief materials for the lanslide-caused barrier lake disaster area in Menling County, southwest China's Tibet Autonomous Region, on Oct. 20, 2018. A helicopter from Xilin Fengteng General Aviation Co., Ltd. took part in the disaster relief to transport relief materials. The barrier lake was formed near a village in Menling County after landslides on Wednesday and Thursday blocked the Yarlung Tsangpo River's waterway. (Xinhua/Purbu Zhaxi)