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Photo taken on Nov. 21, 2019 shows the campus of Hong Kong Polytechnic University (PolyU), as seen through the broken glass of a classroom, in Hong Kong, south China. As most of the rioters have surrendered, the standoff at the Hong Kong Polytechnic University (PolyU) that has lasted for more than a week is approaching an end. But the chaos caused at the university lingers, and healing the deep scars left at the campus will be an arduous process. (Xinhua/Zhu Xiang)