干净的时候是黑的,脏的时候是白的,这是什么东西呢?
黑板Blackboard
it is clean when it is black.it is dirty when itis white.what is it
it is clean when it is black.it is dirty when itis white.what is it
英语人气:174 ℃时间:2019-12-29 22:14:37
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