Because of this, the metaprogramming system should be customizable to produce output for a wide variety of systems.

由于这个原因，元编程系统应该可以进行定制，从而为各种系统产生输出。

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The best systems are those that allow you to work at multiple levels of abstraction within the metaprogramming system itself.

最好的系统可以让您在元编程系统本身内部就可以进行多级抽象。

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For making this both easier and more standardized, Embedded SQL is a metaprogramming system used to easily combine database access with C.

要让这个过程变得又简单、又标准化，那么嵌入式 SQL 就是一个很好的元编程系统，可以在 C 语言中简单地合并数据库访问的功能。

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