清单3包括了必须的模块头(它定义了模块的API、类型和宏)。

Listing 3 includes the necessary module header (which defines the module APIs, types, and macros).

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使用指令可以有条件地处理生成文件，显示错误消息，包括其他生成文件，取消定义宏以及打开或关闭某些选项。

Using directives, you can conditionally process your makefile, display error messages, include other makefiles, undefine a macro, and turn certain options on or off.

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所述方法包括以下步骤：定义由非交叠宏块组成的虚拟结构，称为虚拟基础层宏块；

The method comprises the following steps:- defining a virtual structure made up of non overlapping macroblocks, called virtual base layer macroblocks;

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