美军研发出可变形车轮 可适应95%的地形
<p><span word="The">The</span> <span word="Pentagon">Pentagon</span> <span word="has">has</span> <span word="developed">developed</span> <span word="a">a</span> <span word="shape">shape</span>-<span word="shifting">shifting</span> <span word="wheel">wheel</span> <span word="to">to</span> <span word="make">make</span> <span word="life">life</span> <span word="easier">easier</span> <span word="for">for</span> <span word="troops">troops</span> <span word="travelling">travelling</span> <span word="over">over</span> <span word="difficult">difficult</span> <span word="terrain">terrain</span>.</p><p>近日，五角大楼研发出了一款可变形车轮，使部队在险要地形上更容易行进。</p><p><span word="A">A</span> <span word="military">military</span> <span word="truck">truck</span> <span word="in">in</span> <span word="which">which</span> <span word="the">the</span> <span word="driver">driver</span> <span word="can">can</span> <span word="switch">switch</span> <span word="the">the</span> <span word="wheels">wheels</span> <span word="to">to</span> <span word="a">a</span> <span word="more">more</span> <span word="triangular">triangular</span> <span word="shape">shape</span> <span word="and">and</span> <span word="back">back</span> <span word="again">again</span> <span word="has">has</span> <span word="been">been</span> <span word="demonstrated">demonstrated</span> <span word="by">by</span> <span word="the">the</span> <span word="defense">defense</span> <span word="advanced">advanced</span> <span word="research">research</span> <span word="projects">projects</span> <span word="agency">agency</span>.</p><p>国防部高级研究计划局展示了一辆军用卡车，驾驶员可以在车里调整车轮，将其变得更像三角形，然后再变回来。</p><p><span word="The">The</span> <span word="shape">shape</span>-<span word="shifting">shifting</span> <span word="rear">rear</span> <span word="wheels">wheels</span> <span word="give">give</span> <span word="the">the</span> <span word="vehicle">vehicle</span> <span word="track">track</span>-<span word="like">like</span> <span word="grip">grip</span> <span word="on">on</span> <span word="soft">soft</span> <span word="or">or</span> <span word="slippery">slippery</span> <span word="terrain">terrain</span>, <span word="but">but</span> <span word="can">can</span> <span word="be">be</span> <span word="converted">converted</span> <span word="back">back</span> <span word="to">to</span> <span word="a">a</span> <span word="more">more</span> <span word="traditional">traditional</span> <span word="round">round</span> <span word="shape">shape</span> <span word="in">in</span> <span word="two">two</span> <span word="seconds">seconds</span> <span word="for">for</span> <span word="harder">harder</span> <span word="surfaces">surfaces</span>.</p><p>可变形的后轮让车辆可以抓住较软的或者光滑的地面，但一旦驶向较硬的地面，它可以在两秒内变回到更加传统的圆形。</p>
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