A monster on a pogo stick!
說明
Q. What's big and green and bounces up and down?
A. A monster on a pogo stick!
在彈簧上的怪物才會是又大又綠又會跳上跳下！
Discussion
Pogo stick（彈簧）是一種可以讓你跳上跳下的玩意，在圖中你可以看到怪物的彈簧。
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