在第三章和第四章继续详细介绍表达式和语句的细节之前，非常有必要介绍一个本章例子中已经展示了的高层次的概念。

Before continuing on to consider the details of expressions and statements in Chapters 3 and 4, it is important to introduce one more high-level concept illustrated by the examples in this chapter.

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这个问题我们已经在第三章讨论过了。

This problem we have examined in chapter 3.

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在第三章中，研究了发电公司的市场力。

In chapter 3, market power of generation companies is discussed.

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In chapter 3 we have the account of crossing the Jordan River.

在第三章中有对渡过约旦河的描写。

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And we'll talk about that and that's what Chapter 3 is about.

我们会在学习第三章时做进一步介绍

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