Cusp is a development environment for the Common Lisp programming language.

Cusp是Common Lisp编程语言的开发环境。

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Derive is written in Lisp, a common programming language that is especially suited for the kind of rule-based processing necessary for transforming one abstract mathematical expression into another.

Derive是使用Lisp语言编写的，Lisp是一种公共编程语言，尤其适合基于规则的处理，该处理是将一个抽象数学表达式变换为另一个表达式所必需的。

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