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aerial air apartment apartments architecture asia asian blue building buildings business cbd center central china chinese city clouds crowded cultural culture district downtown glass green high hotel house houses industrial jiangsu jinling lake landmark life mall matchbox metropolis metropolitan modern mountain nanjing nankin nanking office panorama panoramic park plaza province purple radio shadow shop shopping sky skyline skyscraper skyscrapers sunshine tour tourism tourist tower travel tree view viewed xinjiekou xuanwu zifeng