1、词语意思不同。
conclude和deduce都有推理、推断的意思。
conclude还有结束、总结、作决定、作协议的含义，例如：
The concert concluded with the National Anthem.
音乐会最后以演奏国歌结束。
2、组合方式不同。
conclude可接名词、代词、动词不定式或从句作宾语，偶尔也可接以“(to be+) adj. ”充当补足语的复合宾语。
deduce接名词或名词从句作宾语，接介词from时，表示“从…推断出”。
3、推理方法不同。
conclude指通过推理或判断而得出结论，例句：
She had concluded from that her grandmother did not like her.
她已从那一点得出结论，断定她祖母不喜欢她。
deduce指在证据的基础上通过有条理的逻辑思维，从一般原则中得出特殊推断，例句：
If you saw a doctor leaving a house, you might deduce the fact that someone in the house was ill.
你要是看到医生从一家出来，你就可以推想那家有人生病。
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