Peter Capaldi’s final episode of Doctor Who this Christmas will feature Pearl Mackie as Bill Potts and be called Twice Upon a Time, it was revealed this evening (23 July) during a cast panel at San Diego Comic Con. Viewers will have to wait until Christmas to discover exactly how Bill, who will appear throughout the episode, makes her return.。泰姬陵,世界上最美丽的陵墓,竣工于1654年,印度莫卧儿王朝皇帝沙贾汗为纪念皇后所建,联合国世界遗产。科学家揭示宏伟陵墓的建筑秘密,以及背后隐藏的权力和背叛。。