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。

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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。

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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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