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By scanning the locations at the bottom of the ocean where sunken ships, treasures and even cities lie, the show tries to answer what they look like, how they got there and if they hide any secrets.。纪录片《幸存者——见证南京1937》（第二辑）不仅要讲述南京大屠杀幸存者当年的遭遇，为那段历史作证，更重要的是要勾连当下，以当下视角解读和理解幸存者的人生故事。。In the heart of the Jordanian desert, the ancient city of Petra is full of mysteries. How was this architectural prowess achieved more than 2,000 years ago? © National Geographic。