比萨斜塔自1173年开始建造，不久之后就出现了地基不平的问题。
Soon after building started in 1173, the foundation of the Pisatower settled unevenly.
不过并非只有大本钟如此。比萨斜塔自12世纪70年代还在建造之时到现在一直不断得到建筑师们的矫正。
But Big Ben isn't alone; architects have been correcting the Leaning Tower of Pisa since the 1170s when it was still being built.
比萨斜塔自1173年开始建造，不久之后就出现了地基不平的问题。
Soon after building started in 1173, the foundation of the Pisa tower settled unevenly.
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