A compactor can crumple up a car into a small cube .

压缩机可将汽车压缩成一小块。

It involves putting a layer of cardboard at the bottom of a rubbish compactor before filling it with waste material , and then putting another layer of cardboard on top .

这也就需要在垃圾捣碎机被填满之前在其底部放置一层纸板，然后在其顶部也放置一层纸板。