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Cargo vessels are berthed at the Guanlei port in Dai Autonomous Prefecture of Xishuangbanna, southwest China's Yunnan Province, March 21, 2016. (Xinhua/Hu Chao)

Cargo vessels are berthed at the Guanlei port in Dai Autonomous Prefecture of Xishuangbanna, southwest China's Yunnan Province, March 21, 2016. (Xinhua/Hu Chao)