More importantly, they want to simplify things for their developers, raising the level of abstraction so that they can get more done more quickly.
更重要的是，他们想简化其开发人员的工作，提升抽象层级，这样就可以更快地做更多的事情。
They allow the programmer to focus more on "what" than on "how" by raising the level of abstraction; that is, details at the machine level are abstracted away.
它们通过提高抽象层次，令程序设计人员比起“如何”更多地关注“做什么”，也就是说，抽象掉了机器层的细节。
Composing functions in complex ways is the key to productivity in functional languages because you're continually raising your level of abstraction.
用复杂的方式组合函数，是函数性语言生产力的关键，这是因为这可不断提高抽象的层次。
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