be known as 意思是:作为.而出名,它的后面可以跟表示某种职业或某物的名词.例如：
Lu Xun is known as a writer.
鲁迅是作为作家而出名.
Zhou Jielun is known as a rap singer.
周杰伦是作为一个rap歌手而出名.
请注意与be known for——“因.而出名”的区别.例如：
Guiling is known for its beautiful view.
桂林是因为它的美丽风景而出名.