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

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

What is black when it is clean and white when it is dirty?
Blackboard黑板

blackboard

what is that?

blackboard
黑板

blackboard

黑板

黑板啦 黑皮鞋,呵呵什么黑的东西都这样啊