Recursion and iteration are two very commonly used, powerful methods of solving complex problems, directly harnessing the power of the computer to calculate things very quickly.
在处理一些复杂问题的时候，最常用到的两个方法是递归和叠代，它们直接利用计算机的高速计算能力解决问题。
You should also be familiar with general programming techniques such as iteration and recursion.
还应该熟悉一般的编程技术，如迭代和递归。
If iteration is a bunch of steps leading to a solution, recursion is like piling all of those steps on top of each other and then quashing them all into the solution.
如果说迭代是逐个解决一大堆步骤的话，递归就是把所有步骤堆起来一次性解决。
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