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Tourists visit Dadukou Ancient Town during a three-day national holiday around Qingming Festival in southwest China's Chongqing, April 6, 2019. (Xinhua/Wang Quanchao)

Tourists visit Dadukou Ancient Town during a three-day national holiday around Qingming Festival in southwest China's Chongqing, April 6, 2019. (Xinhua/Wang Quanchao)