其中，三种常见的策略为：回写（writeback）、预定（ordered）和数据（data）。

Three of the most common strategies are writeback, ordered, and data.

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在写事务中，所有的变更必须全部提交或者全部回滚。

In a write transaction, all changes must either all commit or all roll back.

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为视图覆写一个现有的回调方法。

Override an existing callback method for the View.

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他一周给他妈妈写一回信。

He writes to his mother once a week.

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我一回来，我将写你的考试时间表。

As soon as I get back, I'll write your exam schedule.

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我一回到美国就给你寄我写的一些书。

I'll send you some of my books after I get back.

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她的很多朋友写电子邮件回谢谢她。

Many of her friends wrote emails back to thank her.

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她的很多朋友写电子邮件回谢谢她。

Many of her friends wrote emails back to thank her.

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