know

　　A. vt.

　　(1)知道

　　I have known him since childhood.

　　(2)懂得

　　Do you know Japanese?

　　B.习语

　　be known as…通称为；以著称；被认为是

　　be known for…因而出名

　　be known to sb.为某人所了解

　　become well known出名

　　for all/anything/ everything I know 据我所知

　　It is well known that…众所周知

　　know about/ of了解；知道

　　know…for certain确实知道

　　know sb. by name仅知道某人的名字（不认识）

　　know sb. by sight与某人面熟（不熟悉）

　　know/learn …by heart背诵

　　make…known/public公告；发表；表示

　　know/ tell right from wrong辨别是非

　　know no limits是无限的

　　A man’s life is limited, but service to the people knows no limits.