These words all mean to agree, often unwillingly, that sth is true.以上各词均含承认之义，常指不情愿地承认某事属实。
admitto agree, often unwillingly, that sth is true指承认（常指不情愿地承认某事属实）：◆It was a stupid thing to do, I admit.我承认，那次干的是件蠢事。
acknowledge(ratherformal) to accept that sth exists, is true or has happened指承认某事物存在或属实：◆She refuses to acknowledge the need for reform.她拒不承认改革的必要性。
recognizeto admit or be aware that sth exists or is true指承认、意识到：◆They recognized the need to take the problem seriously.他们认识到需要严肃对待这个问题。
concede(ratherformal) to admit, often unwillingly, that sth is true or logical指承认（常指不情愿地承认某事属实或合乎逻辑）：◆He was forced to concede (that) there might be difficulties.他被迫承认可能有困难。
admit or concede?用 admit 还是 concede？
When sb admits sth, they are usually agreeing that sth which is generally considered bad or wrong is true or has happened, especially when it relates to their own actions. When sb concedes sth, they are usually accepting, unwillingly, that a particular fact or statement is true or logical. * admit 通常指承认普遍认为不好或错误的事情属实或确实发生过，尤指与自己行为有关。concede 通常指勉强承认某事属实或某种说法合乎逻辑。
confess(ratherformal) to admit sth that you feel ashamed or embarrassed about指承认自己感到羞愧或尴尬的事：◆She was reluctant to confess her ignorance.她不愿意承认自己无知。
Patterns
to admit/acknowledge/recognize/concede/confess that…
