What is black when its clean and white when its dirty?

What is black when its clean and white when its dirty?朗读

什么东西干净的时候是黑色的,脏的时候是白色的。答案:黑板 黑板

相关名句: W h a t i s b l c k w e n d r y
相关谜语: W h a t i s b l c k w e n d r y

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