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If you write on the blackboard, rub it off at the end of the lesson.
如果你在黑板上写字，下课时要擦掉。
《牛津词典》
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Who wrote those rude-words on the blackboard? Rub them off please!
是谁在黑板上写的那些粗话？请擦掉！
youdao
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Who wrote those rude-words on the blackboard? Rub them off please!
是谁在黑板上写的那些粗话？请擦掉！
youdao