问题标题:
Whichiscieanwhenitisblackanddirtywhenitiswhite?
问题描述:
Whichiscieanwhenitisblackanddirtywhenitiswhite?
邱燕霖回答:
什么东西干净的时候是黑的,脏了就白了
Blackboard.黑板
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Whichiscieanwhenitisblackanddirtywhenitiswhite?