a law of nature的用法和样例：
- This is a matter of a law of nature.
- This is a law of nature and it can't be helped.
- Everything still has a law of nature, who can go against it won.
- The assumption underlying this statement is that there exists a law of nature according to which all men are equal.
- His face was like a law of nature -- a thing one could not question, alter or implore.