求翻译：I was giving the class when her giggling drew my attention. Walking over to the young troublemaker, I asked for the note in her hands. It was a hand-drawn picture of me, teeth blackened, nostrils (鼻孔) upwards, and the words "I'm stupid" coming out of my mouth. I managed to fold up the picture calmly and continue the cl是什么意思？

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