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

问题描述:

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

What is clean when it is black and dirty when it is white? (原文blanck有误)
什么东西黑色时是干净的,白色时却是脏的?
blackboard 黑板

blackboard黑板

the blackboard黑板
译为:什么东西黑色时是干净的,白色时却是脏的?
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什么东西是干净的时候是黑色的,脏得时候是白色的?
我猜blackboard 黑板