This article examines the three timer classes and helps you gain an understanding of how and when each class should be used.

本文章将研究这三个类并让你理解如何及何时应该使用哪一个类。

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When you created the NIB file, you also created the controller class for each view.

在您创建NIB文件之后，您还需要为每个视图创建控制器类。

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When I add new features to a class, each new member can see the other visible members, so the theoretical complexity increases.

在类中添加新特性时，每个新成员都能看到其他可见的成员，这增加了理论上的复杂性。

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The justices also questioned whether an arbitrator had the power to bind thousands of absent class members, each of whom had signed their own arbitration agreements, to a class action when they might not want to belong to one.

FORBES: Supreme Court Shows Skepticism About Class Arbitration

And Hancock and his descendants served as a constant source of conversation between my father and me, a vital link between us when, class-wise, and in every other wise, each year placed us farther apart.

NEWYORKER: Dead Man Laughing

The biggest difference, Prof Nicolson says, is that when the class is broken down into ability groups within the literacy hour each day, the teacher has to move from one to another.

BBC: News | Education | Catching up with reading