Why suitcases rock and fall over – puzzle solved 科学家解开拉杆箱摇摇欲倒的物理谜题
<p><span word="Why">Why</span> <span word="suitcases">suitcases</span> <span word="rock">rock</span> <span word="and">and</span> <span word="fall">fall</span> <span word="over">over</span> – <span word="puzzle">puzzle</span> <span word="solved">solved</span> 科学家解开拉杆箱摇摇欲倒的物理谜题</p><p> 相信很多人都对下面的这个情景深有体会：为了赶火车或飞机，我们费力地拖着一个两轮拉杆箱向前奔跑，而箱子会左右摇晃，眼看着就要翻倒，着实让人提心吊胆。现在，科学家们已经针对这个令人费解的日常物理难题展开了研究调查，结果他们发现，避免该现象的方法可能和我们的预期有所不同。请听报道。 </p><p><span word="It">It</span>’<span word="s">s</span> <span word="a">a</span> <span word="common">common</span> <span word="experience">experience</span> <span word="when">when</span> <span word="dashing">dashing</span> <span word="for">for</span> <span word="a">a</span> <span word="train">train</span> <span word="while">while</span> <span word="lugging">lugging</span> <span word="a">a</span> <span word="two">two</span>-<span word="wheeled">wheeled</span> <span word="suitcase">suitcase</span>, <span word="the">the</span> <span word="bag">bag</span> <span word="rocks">rocks</span> <span word="alarmingly">alarmingly</span> <span word="from">from</span> <span word="side">side</span> <span word="to">to</span> <span word="side">side</span> <span word="and">and</span> <span word="threatens">threatens</span> <span word="to">to</span> <span word="overturn">overturn</span>.</p><p><span word="To">To</span> <span word="explain">explain</span> <span word="why">why</span> <span word="this">this</span> <span word="happens">happens</span>, <span word="French">French</span> <span word="researchers">researchers</span> <span word="studied">studied</span> <span word="a">a</span> <span word="model">model</span> <span word="suitcase">suitcase</span> <span word="on">on</span> <span word="a">a</span> <span word="treadmill">treadmill</span> <span word="and">and</span> <span word="did">did</span> <span word="some">some</span> <span word="number">number</span>-<span word="crunching">crunching</span>. <span word="And">And</span> <span word="it">it</span> <span word="turns">turns</span> <span word="out">out</span>, <span word="that">that</span> <span word="rather">rather</span> <span word="than">than</span> <span word="slowing">slowing</span> <span word="down">down</span>, <span word="as">as</span> <span word="you">you</span> <span word="might">might</span> <span word="expect">expect</span>, <span word="you">you</span> <span word="should">should</span> <span word="actually">actually</span> <span word="speed">speed</span> <span word="up">up</span> <span word="to">to</span> <span word="tame">tame</span> <span word="your">your</span> <span word="unruly">unruly</span> <span word="suitcase">suitcase</span>.</p><p><span word="Scientists">Scientists</span> <span word="say">say</span>, <span word="while">while</span> <span word="it">it</span>’<span word="s">s</span> <span word="a">a</span> <span word="fun">fun</span> <span word="way">way</span> <span word="to">to</span> <span word="tackle">tackle</span> <span word="the">the</span> <span word="problem">problem</span>, <span word="the">the</span> <span word="study">study</span> <span word="could">could</span> <span word="have">have</span> <span word="applications">applications</span> <span word="with">with</span> <span word="other">other</span> <span word="two">two</span>-<span word="wheeled">wheeled</span> <span word="things">things</span> <span word="from">from</span> <span word="trailers">trailers</span> <span word="to">to</span> <span word="caravans">caravans</span>. </p><p>词汇表<span word="dashing">dashing</span> 猛冲，突然奔跑</p><p><span word="lugging">lugging</span> 用力拖着</p><p><span word="two">two</span>-<span word="wheeled">wheeled</span> 两轮的</p><p><span word="suitcase">suitcase</span> 行李箱，这里指拉杆箱</p><p><span word="rocks">rocks</span> 摇晃，摇摆</p><p><span word="alarmingly">alarmingly</span> 令人惊慌地，让人担忧地</p><p><span word="from">from</span> <span word="side">side</span> <span word="to">to</span> <span word="side">side</span> 左右、来回地</p><p><span word="threatens">threatens</span> 预示着、快要发生（不好的事情）</p>
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