英语口语表达“put two and two together 把二和二放一起”的意思就是“根据所见所闻推定，综合判断”。我们多在口语交流中用这个表达强调根据已知的一些情况来判断事情的真相。与这个表达相关联的一个说法“put two and two together and make five 把二和二放一起得出五”的意思是“听风就是雨”，强调某人夸大事实，捕风捉影。

例句

When I saw photos of James and Sally together in Las Vegas, I put two and two together and guessed they were more than just friends.

当我看到詹姆士和萨利在拉斯维加斯拍的照片时，我推断出他们之间的关系并不仅仅是朋友。

Wendy accidentally shared a selfie with the caption 'twenty weeks', and friends put two and two together – she's pregnant.

Wendy 一不小心在社交网站上发布了一张带有标注文字“20周”的自拍照，结果朋友们推断出她一定是怀孕了。

It's typical of him to put two and two together and make five. I am used to it now.

他经常乱下结论，我都已经习惯了。