非常酷的一点：轮胎由结实的橡胶环刻而成(当时的轮胎都不充气的)，这是唯一能支撑车重的方法。
One cool bit: the tires were chiseled from solid blocks of rubber, the only way to support the weight of the car.
用千斤顶把车支撑起来，这样你就能够换轮胎了。
这些单元在平时的时候不承载车辆的重量，只有当轮胎被打破了才会担负起承载的重任，这时候车辆的重量会转移到这些单元上，它们能支撑车辆继续以一定的速度移动一段距离。
The insert bears no vehicle load until the tire is punctured, at which point the load is transferred to the insert and vehicle movement may continue for a limited distance and speed.
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