几年以后 ,分布在美国高速公路上的载重汽车称重站可能终将变为“遗址”——它们正在被一种“智能水泥”地面所代替。这种地面能够辨别出从它上面开过的每一辆车的重量和时速。这种加入碳素纤维制成的水泥随着所受压力的改变而改变其本身的电阻 ,所以 ,当一辆卡车从智能水泥上 A few years later, truck weighing stations on the U.S. freeways may eventually become “ruins” - they are being replaced by a “smart cement” floor. The ground is able to tell the weight and speed of every car passing over it. This cement made of carbon fiber changes its resistance as the pressure is changed, so when a truck moves from smart cement