cushion theory

例句：

1. 1. The sofa is too soft; I need a cushion to support my back.
   沙发太软了，我需要一个垫子来支撑我的背部。
2. 2. The cushion of the chair was worn out after several years of use.
   椅子的垫子在使用几年后磨损了。
3. 3. The cushions on the floor are soft and comfortable for people to walk on.
   地板上的垫子柔软舒适，人们可以在上面行走。