elastic side wall

例句：

1. 1. The material is elastic, so it can stretch easily.
   这种材料有弹性，所以可以很容易地拉伸。
2. 2.The rubber band is elastic, so it will return to its original shape when you pull on it.
   橡皮筋是弹性的，所以当你拉它的时候它会恢复到原来的形状。
3. 3.The fabric is elastic, which makes it comfortable to wear.
   这种布料是弹性的，这使得穿着很舒服。