2PHRASE 一个巴掌拍不响;双方都有责任 If you say it takes two or it takes two to tango, you mean that a situation or argument involves two people and they are both therefore responsible for it. 一个巴掌拍不响;双方都有责任
Divorce is never the fault of one partner; it takes two.
离婚从来都不是一方的错误:双方都有责任。
It takes two to tango and so far our relationship has been one-sided.
双方都应该努力,可迄今为止我们的关系只是一厢情愿。
3PHRASE 根据现有的信息推断 If you put two and two together, you work out the truth about something for yourself, by using the information that is available to you. 根据现有的信息推断
Putting two and two together, I assume that this was the car he used.
根据我的了解,我猜想这是他曾开过的车子。
4 to kill two birds with one stone→see: bird two a penny→see: penny