According to this transformation grammar, a program transformation algorithm can transform source language programs into object language programs.

程序转换算法根据转换文法，可把源语言程序转换为目标语言程序。

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The expressiveness of an interface-oriented language allows us to write object oriented programs.

面向接口的语言允许我们写面向对象的程序。

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The language of the programs that are manipulated is called the object language.

语言的程序，操纵被称为对象的语言。

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