gum elastic

This old toy is made of gum elastic, so it can stretch without breaking.

这个旧玩具是用弹性树胶做的，所以它能拉伸而不会断裂。

In the past, workers used gum elastic to make waterproof boots.

过去，工人们用弹性树胶制作防水靴。

Gum elastic feels smooth and bounces well when you drop it.

弹性树胶摸起来光滑，掉落时弹跳得很好。