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Efforts taken to restore ecological environment in upper reaches of Yangtze River in Yunnan

Xinhua | Updated: 2018-04-29 16:12
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File photo taken on Feb 16, 2017 shows black-necked cranes at the Dashanbao state nature reserve of black-necked cranes in Zhaotong, Southwest China's Yunnan province. [Photo/Xinhua]
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