What is black when it is clean and white when it is dirty?
什么东西干净的时候是黑色的~脏了的时候是白色的？
What is black when it is clean and white when it is dirty?
什么东西干净的时候是黑的，脏的时候是白的？
What is black when it is clean and white when it is dirty?
什么东西干净时是黑色的，脏时是白的？
What is clean when it is black, and it is white when it is dirty.
当它干净的时候，它是黑的，当它脏的时候，他是白的。
What is clean when it is black and dirty when it is white?
什么东西黑的时候是干净的，白的时候是脏的？
What is clean when it is black and dirty when it is white?
什么东西干净的时候是黑的，脏的时候却是白的呢？
What is clean when it is black and dirty when it is white?
什么东西干净的时候是黑的，脏的时候却是白的呢？
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