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A worker examines a sewage recycling pool in the coal liquefaction factory of CHN Energy in Ordos, north China's Inner Mongolia Autonomous Region, April 11, 2019. (Xinhua/Liu Lei)
A worker examines a sewage recycling pool in the coal liquefaction factory of CHN Energy in Ordos, north China's Inner Mongolia Autonomous Region, April 11, 2019. (Xinhua/Liu Lei)