这位歌手因其独特的嗓音而广为人知。

The singer is well known for his unique voice.

well 是副词，表示"好地、充分地"。 known 是动词 know 的过去分词，know 的意思是"知道、了解"。 well known 是一个固定短语，意思是"广为人知的、著名的"，表示某人或某事物被很多人知晓和认可。