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.
双语例句
例：
Divorce is never the fault of one partner; it takes two.
离婚从来就不是哪一方的错，双方都有责任。
put two and two together
1.?根据已知信息分析
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.
双语例句
例：
Putting two and two together, I assume that this was the car he used.