比萨斜塔为何能经历4次大地震而不倒？
<p><span word="New">New</span> <span word="research">research</span> <span word="has">has</span> <span word="revealed">revealed</span> <span word="how">how</span> <span word="the">the</span> <span word="iconic">iconic</span> <span word="Leaning">Leaning</span> <span word="Tower">Tower</span> <span word="of">of</span> <span word="Pisa">Pisa</span> <span word="has">has</span> <span word="managed">managed</span> <span word="to">to</span> <span word="stay">stay</span> <span word="standing">standing</span> – <span word="and">and</span> <span word="intact">intact</span> – <span word="in">in</span> <span word="the">the</span> <span word="face">face</span> <span word="of">of</span> <span word="four">four</span> <span word="strong">strong</span> <span word="earthquakes">earthquakes</span> <span word="and">and</span> <span word="a">a</span> <span word="precarious">precarious</span> <span word="lean">lean</span> <span word="of">of</span> <span word="five">five</span> <span word="degrees">degrees</span>.</p><p>意大利的标志性建筑比萨斜塔有5度的倾斜度，而且还历经4次大地震，却依然屹立不倒，完好无损，最新的研究揭开了这个谜底。</p><p><span word="The">The</span> <span word="vulnerability">vulnerability</span> <span word="of">of</span> <span word="the">the</span> <span word="Unesco">Unesco</span> <span word="World">World</span> <span word="Heritage">Heritage</span> <span word="Site">Site</span> <span word="has">has</span> <span word="mystified">mystified</span> <span word="engineers">engineers</span> <span word="and">and</span> <span word="scientists">scientists</span> <span word="for">for</span> <span word="millennia">millennia</span>. <span word="Moderate">Moderate</span> <span word="seismic">seismic</span> <span word="activity">activity</span> <span word="was">was</span> <span word="expected">expected</span> <span word="to">to</span> <span word="significantly">significantly</span> <span word="damage">damage</span> <span word="the">the</span> 58<span word="m">m</span> <span word="tall">tall</span> <span word="Tower">Tower</span>, <span word="or">or</span> <span word="even">even</span> <span word="result">result</span> <span word="in">in</span> <span word="collapse">collapse</span> <span word="but">but</span>, <span word="incredibly">incredibly</span>, <span word="this">this</span> <span word="has">has</span> <span word="not">not</span> <span word="happened">happened</span>.</p><p>比萨斜塔高58米，被评为联合国教科文组织世界遗产。一千年来，比萨斜塔的脆弱性一直令工程师和科学家们困惑不已。按说，中度地震活动应该就能导致它严重受损甚至倒塌，但现实中这样的情形并未发生，令人不可思议。</p>
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