That's why there are nowhile loops or for loops in Haskell and instead we many times have to use recursion to declare what something is.
这便是haskell没有while或for循环的原因，我们的替代方案是使用递归。
2
While there's no simple definition for it.
然而，并不能简单地定义它。
3
But, unlike the cores of the inner planets, the Moon's core contains little or no iron, while the typical planet-forming materials were quite rich in iron.