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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As a prospective parent, burying beetles find a dead animal, such as a mouse or bird, and roll the carcass into a ball.

作为准父母，埋葬虫找到一只死动物，例如一只老鼠或鸟儿，并将其尸体卷成一个球。

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