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If you say that something you hear goes in one ear and out the other, you mean you quickly forget it.
左耳朵進右耳朵出;當作耳邊風
If I have to listen to something I don't understand, it just goes in one ear and out the other.
要是非得讓我聽我不懂的事情，那也只是左耳朵進右耳朵出。