定义了与蓝牙模块应用相关的BT指令语言，并实现语言的语法解析器。

Define a new command language, called BT language, for module application, realize the command syntax parser as well.

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这个语言指令告诉计算机：在内存中，为那个被程序员命名为X的变量寻找一个地址，并把数值2存储进去。

The language instruction tells the computer to find a place in its memory, which the programmer wants to call X and to put 2 in there.

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第1章到第6章遵循这一策略；TT语言、指令、过滤器和插件都解释得很详细，令人满意。

Chapters 1 through 6 follow this strategy; the TT language, directives, filters, and plug-ins are explained in very satisfactory detail.

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