over放在次数后面，放在again前面

twice over

three times over

four times over

over again

all over again

over and over again

over adv.再一次;又一次；重复地 (英文解释：If you do something over, you do it again or start doing it again from the beginning.）

She said if she had the chance to do it over, she would have hired a press secretary.

她说如果有机会从头来过，她会雇一位新闻秘书。

Dave, the pianist, played it over a couple of times.

演奏钢琴的戴夫将这支曲子反复弹了两三遍。

twice over,three times over（强调发生不止一次）两次/三次 (英文解释：If you say that something happened twice over ,three times over and so on, you are stating the number of times that it happened and emphasizing that it happened more than once）

He had to have everything spelled out twice over for him. 

他不得不把所有事项都对他详细说明了两次。

(3)over again 再一次；重新

When you realise they are singing the same songs over again, the novelty wears off.

当你意识到他们开始从头演唱同样的歌曲时，新鲜感也就没有了。

If I was living my life over again I wouldn't have attended so many committee meetings. 

如果生命可以重来，我再也不会参加这么多委员会会议了。

(4)all over again （指令人疲倦、厌烦、不快地）再一次，又一次，重新

He doesn't want the hassle all over again.

他不想再惹这种麻烦了。

The whole process started all over again..

整个程序又再次开始了。

He had to prove himself all over again. 

他不得不重新证明自己。

(5)over and over again 一再；再三；反复

He plays the same songs over and over.

他一遍又一遍地放着同样的歌曲。

'I don't understand it,' he said, over and over again. 

“我不明白，”他反复不停地说。