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The Pentagon has developed a shape-shifting wheel to make life easier for troops travelling over difficult terrain. 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。 A military truck in which the driver can switch the wheels to a more triangular shape and back again has been demonstrated by the defense advanced research projects agency. 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。 The shape-shifting rear wheels give the vehicle track-like grip on soft or slippery terrain, but can be converted back to a more traditional round shape in two seconds for harder surfaces. 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。 | 
