[参考译文]历史上有石器时代、铁器时代,人类往往用某种材料来命名一个时代。那么,未来数十年将称作什么时代呢?要选择一种代表性的材料可不容易。试想:高保真度的扬声器将用透明塑料薄膜制成;轻轻按动开关,挡风玻璃就会变色;无摩擦的卡车发动机用不着水箱,一加仑汽油能行驶100英里;永不生锈的轿车将在没有坑洼的公路 In the Stone Age and the Iron Age, humankind used a material to name an era. Then, what are the decades to be called? It is not easy to choose a representative material. Imagine: high-fidelity speakers will be made of clear plastic film; the windshield will change color when the switch is pressed lightly; the frictionless truck engine needs no water tank; one gallon of gasoline can travel 100 miles; never rust Cars will be on the road without pits