two heads are better than one 人多智广；三个臭皮匠，顶个诸葛亮

eg. After all, two heads are better than one. Two people working together can get better results.
毕竟“三个臭皮匠，顶个诸葛亮”，两个人一起工作能取得更好的成果。

there are no two ways about it 别无选择；没有退路

eg. We have to win this game, and there are no two ways about it.
我们已经没有退路了，这场比赛我们非赢不可。

put two and two together 根据事实推理

eg. If we put two and two together, we might come up with the right answer.
如果根据事实推理，我们就能得出正确答案。

of two minds 举棋不定，犹豫不决

eg. He always seems to be of two minds on important matters.
别指望 他能做出决定。 在重要事情上他好像总拿不定主意。

two shakes of a lamb's tail 迅速地；简易地

eg. But with any luck, we could solve the problem in two shakes of a lamb's tail.
但幸运的话，我们能迅速解决问题。

kill two birds with one stone 一箭双雕，一举两得

eg. I always get my nails manicured while I get my hair cut, that way I can kill two birds with one stone.
每次我去剪头发的时候都会修指甲，这样我可以一举两得。

two wrongs don't make a right 负负不得正

eg. But we must remember that two wrongs don't make a right. If someone does something bad to you, you should not do the same to him.
但是我们必须要记住：负负不得正，如果有人冒犯了你，你不应该以牙还牙。

two's company, three's a crowd 俩人结伴，三人添乱

eg. Two's company, three's a crowd, so please don't come with my girlfriend and me.
两人刚好，三人嫌太挤，所以你就别跟着我和我的女朋友了。