What is biack when it is clean and white when it is dirty?

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What  is biack when it is clean and white when it is  dirty?
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What is biack when it is clean and white when it is dirty?
What is biack when it is clean and white when it is dirty?

What is biack when it is clean and white when it is dirty?
什么东西干净的时候是黑的,但是脏的时候是白的?

英语谜语,意思是:
什么东西黑的时候是干净的,而白的时候是脏的?
答案就是Blackboard,黑板。