Interpreter and libraries

说明：  Haskell编译器和库 Haskell是一种广谱语言，适合各种应用。他尤其适合需要高度可修改和维护的程序。大多数软件产品的生命期主要花费在规范，设计和维护而不是编程。函数式语言能很好的写能够真正执行（也可以测试和调试）的规范，该规范也就是最终程序的第一个原型。
(Haskell compiler and libraries Haskell is a broad-spectrum language, suitable for a variety of applications. In particular, he needs highly suitable for modification and maintenance procedures. The majority of software products mainly spent his life in the specifications, design and maintenance rather than programming. Language function can be good to write genuine implementation (also can test and debug) norms, the specification is the final procedures for the prototype.)