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泷泷大魔王
notcarefullycarelesslyaccidentally我一不小心碰了书架上的一本书，而上面所有的书都掉下来了。Ihitjustonebookonthebookshelfcarelesslyandallthebooksonitcamedown.
Sophie小蕉
a little slip from concentrationa little carelessness
念念1218
一不小心 carelessly一不小心,一不留神In an unguarded moment路上的坑坑洼洼骑车的人一不小心就有致命危险.Pot-holes can be lethal for the unwary cyclist.The slightest carelessness in feeding can result in their death. 饲养稍不小心，它们就可能死亡
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