ActiveRecord is a perfectly capable persistence framework.
ActiveRecord是一种功能完善的持久性框架。
The second, and more typical, example is the use of a persistence framework.
第二个，也是更典型的例子是持久性框架的使用。
That was because nobody decided upfront what persistence framework was to be used.
这是因为没有人事先决定使用什么持久化框架。
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