第二部分介绍了数据子语言的预编译技术；
Second, we introduce the precompiler technics for Data Sublanguage.
使用嵌入式SQL，数据库编程的复杂性可以通过一些宏子语言来屏蔽。
With Embedded SQL, the intricacies of database programming are masked by a sort of macro sub-language.
在多库系统中，对全局视图的存取操作要分解为针对多个LDB的子操作，可能还要对数据模式及查询语言进行转换。
In multidatabase, access to global view will be decomposed to several sub-operations to several LDB, and perhaps also need data schema translation and query processing.
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