put two and two together
将两个事物联系起来，得出合理的结论
口语·表达推理或联想
英文释义
to draw a logical conclusion or figure something out by connecting the dots or clues
例句
I saw his car outside her house and put two and two together.
典故来源
源自基础算术，将两个数字相加得出结果，比喻根据线索推理出结论。