Regardless of how accessible or engaging a textbook is,we recognize that many students do not read the chapters fromfront to back. Instead, they use the text “backward.” That is,they go to the assigned exercises and try them, and if they getstuck, they turn to the text to look for examples to help them.Thus, this text features clearly marked, step-by-step examplesthat students can follow. Each detailed example is linked to asection exercise, which students can use to build specific skills needed to work exercises in the section.

不管一本教科书有多容易阅读或吸引人，我们都认识到许多学生不会从头到尾阅读章节。取而代之的是，他们使用文本“向后”，也就是说，他们去指定的练习，并尝试他们，如果他们卡住了，他们转向文本，寻找例子来帮助他们。所以，这篇课文有清晰的标记，学生可以遵循的一步一步的例子。每一个详细的例子都与部分练习相联系，学生可以利用这些练习来建立特定的技能需要在该部分进行练习。