1. 认识;认出
    If you recognize someone or something, you know who that person is or what that thing is.

    e.g. The receptionist recognized him at once...
           接待员一眼就认出他了。
    e.g. He did not think she could recognize his car in the snow...
           他觉得她在雪天里认不出他的车子。

2. 认可；承认
    If someone says that they recognize something, they acknowledge that it exists or that it is true.

    e.g. I recognize my own shortcomings...
           我承认自己的缺点。
    e.g. Well, of course I recognize that evil exists.
           嗯，我当然承认邪恶的存在。

3. 正式认可;承认;正式接受;赞成
    If people or organizations recognize something as valid, they officially accept it or approve of it.

    e.g. Most doctors appear to recognize homeopathy as a legitimate form of medicine...
           大多数医生似乎都接受顺势疗法是一种合理的医疗手段。
    e.g. France is on the point of recognizing the independence of the Baltic States.
           法国即将承认波罗的海诸国的独立。

4. 赞赏，认可（某人的所作所为）
    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.

    e.g. The RAF recognized him as an outstandingly able engineer...
           英国皇家空军表彰他是一名非常能干的机械师。
    e.g. He had the insight to recognize their talents...
           他很有眼力，慧眼识英才。