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Visitors enjoy the scenery inside a cave in north China's Tianjin, Oct. 3, 2018, the third day of the week-long National Day holiday. (Xinhua/Yue Yuewei)
Visitors enjoy the scenery inside a cave in north China's Tianjin, Oct. 3, 2018, the third day of the week-long National Day holiday. (Xinhua/Yue Yuewei)