create .produce .invent.discover的区别?

1.create指有目的地把原材料制成新产品,定也指创造出原来不存在的或与众不同的事物.
eg.He created quite a number of wonderful characters in his play.
2.produce 指通过劳动加工而生产产品,尤指工农业产品.生产.
eg.We must produce more food for ourselves and import less.
3.invent 指通过想象、研究、劳动而创造前所未有的东西,尤指科技上的发明创造.
eg.Can you tell me who invented the telephone?
4.discover指发现了原来存在,但尚未被人挖掘或认识的事物.
eg.Columbus discovered America in 1492.
这几题的答案分别是：invented produced discovered created