V-T If you recognize someone or something, you know who that person is or what that thing is. 认出 [no cont]
V-T If someone says that they recognize something, they acknowledge that it exists or that it is true. 承认 [no cont]
V-T If people or organizations recognize something as valid, they officially accept it or approve of it. 承认; 赞成
V-T When people recognize the work that someone has done, they show their appreciation of it, often by giving that person an award of some kind. 赏识; 表彰
recognize意思是认识,认出,辨别出,承认,意识到,认可,接受,赞成。know意思是知道,了解,懂得,确信,肯定。recognize通常表达的意思是之前就知道,经过一段间隔或别的原因后又重新认出来,属于终止性动词,而know是延续性动词,指十分熟悉,很了解。比如:I know him but I didn't recognize him just now because he changed too much. 我认识他,但是刚刚我没认出他,因为他变化太大了。