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A vessel sails on a lake at the Xiaonanhai scenic spot in Chongqing, southwest China, April 4, 2016. As the spring comes, many tourists come to the scenic spot for a trip. (Xinhua/Yang Min)

Vessels sail on a lake at the Xiaonanhai scenic spot in Chongqing, southwest China, April 4, 2016. As the spring comes, many tourists come to the scenic spot for a trip. (Xinhua/Yang Min)

Tourists walk on a drawbridge at the Xiaonanhai scenic spot in Chongqing, southwest China, April 4, 2016. As the spring comes, many tourists come to the scenic spot for a trip. (Xinhua/Yang Min)