Certain classes of mail have to is sign for when they is deliver.
某些类的邮件在送达时必须签收。
Worse, they break certain behaviors you expect of your classes.
更糟的是，它们破坏了您所希望的类的某些行为。
From our list of class responsibilities we can deduce certain attributes for our analysis classes.
从类的职责列表中，我们可以确定分析类的一些属性。
Some of them skip classes just because they have no interest in certain subjects.
他们中的一些人逃课，只是因为他们对某些科目没有兴趣。
Some of them skip classes just because they have no interest in certain subjects.
他们中的一些人逃课，只是由于他们对某些科目没有乐趣。
Some of them skip classes just because they have no interest in certain subjects.
有的跳班仅仅是因为他们没有在某些科目的兴趣。
Some of them skip classes just because they have no interest in certain subjects.
有的跳班仅仅是因为他们没有在某些科目的兴趣。
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