英语语法分析

The precompiler does three things.

预编译器要做三件事。

Second, we introduce the precompiler technics for Data Sublanguage.

第二部分介绍了数据子语言的预编译技术；

I guess that such a situation is also helpful for other compilers supporting some precompiler headers.

我想这种情况对于支持某些预编译头文件的其他编译器也有帮助。