disaster是灾难的意思，而devastate则是毁灭的意思，区别可以从以下例子看出：
If someone use the nuclear weapons, that would be disaster for human, as that would be devastating results for the world. 如果有人使用核武器，那将是人类的灾难，因为这对世界来说将是毁灭性的结果。
水利万物而不争,
而万物莫能与之争。
