What is clean whenit isblack,and it is white when it is dirty?谁会翻译并解答

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What is clean whenit isblack,and it is white when it is dirty?谁会翻译并解答
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What is clean whenit isblack,and it is white when it is dirty?谁会翻译并解答
What is clean whenit isblack,and it is white when it is dirty?谁会翻译并解答

What is clean whenit isblack,and it is white when it is dirty?谁会翻译并解答
当它是黑色的时候是干净的,当它是白色的时候是脏的,这是什么东西?
答案:Blackboard (黑板)

???

什么东西干净的时候是黑色,脏的时候是白色?()