No artificially-crafted precious stones or metals are comparable with this precious treasure of the mother nature. 并请参考newvoice给小薇的点评，用none of
这里可以用复数，其实一般情况下应是复数。
用None of 也可以。
用no时它当形容词用。用none 0f ... none时none是代名词。
no 2 (n)
adj.
1. Not any; not one; not a: No cookies are left.
2. Not at all; not close to being: He is no child.
3. Hardly any: got there in no time flat. See Usage Note at nor1.
none (nn)
pron.
1. No one; not one; nobody: None dared to do it.
2. Not any: None of my classmates survived the war.
3. No part; not any: none of your business.
catagorzied： 请参考newvoice给小薇的点评。
看了。
多谢好学的美风。
