1 (used to emphasize that sth is correct in every way) just （用于强调）正好: You've arrived at exactly the right moment. 你来得正是时候。I found exactly what I wanted. 我找到了我正要找的东西。

2 used to ask for, or give, completely correct information 准确地: He took exactly one hour to finish. 他花了正好一个钟头完成，不多不少。 [SYN] precisely 同义词为 precisely

3 (spoken 口语) (used for agreeing with a statement) yes; you are right （表示同意）对的，正确: ‘I don't think she's old enough to travel on her own.’ ‘Exactly.’ “她年纪还小，我认为不该独个儿旅行。”“说得对。”

1 (used when you are saying the opposite of what you really mean) not really; not at all （表达与实际相反的意思）并不，一点也不: He's not exactly the most careful driver I know. 他并不是我认识的开车最小心的司机。

2 (used as an answer to say that sth is almost true) （用于回答，表示几乎正确）: ‘So you think I'm wrong?’ ‘No, not exactly, but ...’ “这么说，你认为我错了？”“不完全是，可是…”