比萨斜塔“斜而不倒”的秘密

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When you hear the word“Pisa”, you immediately think of the Leaning(倾斜)Tower. Although it\'s famous now, its creators never intended it to be. It was supposed to be a straightforward bell tower be?hind a cathedral. Today it is considered one of the wonders of the medieval(中古的)world.rnSo what happened to change the plan? Well, the construction began in 1173. Things progressed a little more slowly back then. It took five years to complete the first three floors. And during those years, the tower stood perfectly straight.
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