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<br /> 译文(3): 在约旦沙漠的中心地带，佩特拉古城充满了神秘色彩。2000多年前，这种建筑技术是如何实现的？
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