What's big and green and bounces up and down?

Image of a monster on a pogo stick

A monster on a pogo stick!

Q. What's big and green and bounces up and down?


A. A monster on a pogo stick!  

在弹簧上的怪物才会是又大又绿又会跳上跳下!

Discussion

Pogo stick(弹簧)是一种可以让你跳上跳下的玩意,在图中你可以看到怪物的弹簧。
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