be famou for和 be known as的区别

be known as 是接职业，但它还有另外一个意思 被称为...
be known as 指 因为做什么职业而出名
be known for 指 因为什么事情或者事儿出名

另外：be known as, be known for, be known to 的意义和用法有什么不同？
be known as 意为“被称作”、“被认为”：
These chocolate bars are known as something else in the US, but I can’t remember what. 这种巧克力棒在美国有别的叫法，但我记不起来叫什么了。
be known for 意为“因…… 而著名”：
He was known for his frankness. 他以坦率而著称。
be known to意为“为……所知”：
He is known to the police because of his previous criminal record. 他因以前的犯罪记录而为警察所知。

be famous for 著称于(以...著名)
Spain used to be famous for its strong armada.

be known as 被称为(以...著称,通称)
Samuel Clemens, who was known as Mark Twain, became a famous American writer.