递归是一门伟大的艺术，使得程序的正确性更容易确认，而不需要牺牲性能，但这需要程序员以一种新的眼光来研究程序设计。
Recursion is a great art, enabling programs for which it is easy to verify correctness without sacrificing performance, but it requires the programmer to look at programming in a new light.
对程序员来说，将自己从代码中抽身出来，以整体的眼光看待问题有时很难。
Sometimes it is hard for us to extract ourselves from coding and then see the “big picture”.
只有缺少技术头脑和经济眼光的人，才会将代码视为程序员应该严格按照时限、预算和规格交付的软件。
Only the lack of technical and economic vision of the human mind, will code as a programmer should be strictly in accordance with the time, budget and specifications of software delivery.
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