Apply suggestions from code review

docs/ch06.md

@@ -18,7 +18,7 @@
 
 > The most important (and perhaps surprising) benefit of the general-purpose approach is that it results in simpler and deeper interfaces than a special-purpose approach. The general-purpose approach can also save you time in the future, if you reuse the class for other purposes. However, even if the module is only used for its original purpose, the general-purpose approach is still better because of its simplicity.
 
-通用方式最重要的（也许是令人惊讶的）好处是，与专用方式相比，它的接口更简单，更深。如果您将该类用于其他目的，则通用方式还可以节省将来的时间。但是，即使该模块仅用于其原始用途，由于其简单性，通用方式仍然更好。
+通用方式最重要的（也许是令人惊讶的）好处是，与专用方式相比，它的接口更简单、更深。如果您将该类用于其他目的，则通用方式还可以节省将来的时间。但是，即使该模块仅用于其原始用途，由于其简单性，通用方式仍然更好。
 
 ## 6.2 Example: storing text for an editor 示例：为编辑器存储文本
 
@@ -134,7 +134,7 @@ Position findNext(Position start, String string);
 
 > Is this API easy to use for my current needs? This question can help you to determine when you have gone too far in making an API simple and general-purpose. If you have to write a lot of additional code to use a class for your current purpose, that’s a red flag that the interface doesn’t provide the right functionality. For example, one approach for the text class would be to design it around single-character operations: insert inserts a single character and delete deletes a single character. This API is both simple and general-purpose. However, it would not be particularly easy to use for a text editor: higher-level code would contain lots of loops to insert or delete ranges of characters. The single-character approach would also be inefficient for large operations. Thus it’s better for the text class to have built-in support for operations on ranges of characters.
 
-这个API对我当前的需求来说容易使用吗？这个问题可以帮助你确定什么时候你在让一个 API 变得简单和通用方面走得太远了。如果您必须编写许多其他代码才能将类用于当前用途，那么这是一个危险信号，即该接口未提供正确的功能。例如，针对文本类的一种方式是围绕单字符操作进行设计：insert 插入单个字符 和 delete 删除单个字符。该 API 既简单又通用。但是，对于文本编辑器来说并不是特别容易使用：更高级别的代码将包含许多循环，用于插入或删除字符范围。单字符方法对于大型操作也将是低效的。因此，文本类最好内置对字符范围操作的支持。
+这个 API 对我当前的需求来说容易使用吗？这个问题可以帮助你确定什么时候你在让一个 API 变得简单和通用方面走得太远了。如果您必须编写许多其他代码才能将类用于当前用途，那么这是一个危险信号，即该接口未提供正确的功能。例如，针对文本类的一种方式是围绕单字符操作进行设计：insert 插入单个字符 和 delete 删除单个字符。该 API 既简单又通用。但是，对于文本编辑器来说并不是特别容易使用：更高级别的代码将包含许多循环，用于插入或删除字符范围。单字符方法对于大型操作也将是低效的。因此，文本类最好内置对字符范围操作的支持。
 
 ## 6.6 Conclusion 结论