1. Joseph Haydn was an Austrian composer and is known as “the father of the symphony”. be known as 作为……出名 be known for 因……而著名 be known to 为……所了解／知道， He is known as a famous singer． 他作为一个著名歌手而出名。 He is known to all in our village.村子里的人都了解他。 Guilin is known for her beautiful mountains and rivers．桂林因其美丽的山水而闻名。