The school's principal, Catherine o 'neill, wrote: "Dear parent, from time to time we will request your daughter to bring in a toilet roll to her class teacher."

学校校长凯瑟琳·奥内尔写道：“亲爱的家长，今后我校将会时常要求您的女儿携带卫生纸卷交给其班主任。”

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Permitting nesting leads to situations where the internal transactions succeed, but the parent can still fail — so how do you roll back previously committed children?

允许嵌套会导致内部事务成功，但父事务仍旧可以失败的情况——那么您如何回滚先前提交了的子事务呢？

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Maybe you're not a roll around on the floor kind of parent with your child.

也许您不辊周围的地板上种母公司与您的孩子。

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