success什么时候是可数的名词?

success 既是可数名词也是不可数名词 ,当它是可数名词时.即指这种抽象名词的具体化.指的是一个具体的人或事.如 She is a success as a manager but a failure as a mother.
The party last night was a success because we all enjoyed ourselves.
success不可数时就是指成功.是抽象的.不能与冠词连用.如
Failure is the mother of success.同时它的反意词failure也是这样用法.

当他的意思是“成功的人，成功的案例”时
he is a success.