deduce

1、追本溯源、追根溯源。

deduce 演绎，推论

de-, 向下。-duc, 拉，引导，词源同induce, conduct. 即向下引导，演绎，推论。

deduce (v.)

early 15c., from Latin deducere "lead down, derive" (in Medieval Latin, "infer logically"), from de- "down" (see de-) + ducere "to lead" (see duke (n.)). Originally literal; sense of "draw a conclusion from something already known" is first recorded 1520s, from Medieval Latin. Related: Deduced; deducing.

1. Can we deduce from your silence that you do not approve?

你保持沉默，我们是否可以据此而推断出你不赞成？

2. The police were able to deduce where the fugitive was hiding.

警方成功地推断出那逃亡者躲藏的地方.

3. We can deduce a conclusion from the premise.

我们可以从这个前提推出结论.

4. If you see a doctor leaving a house, you may deduce that someone in the house is ill.

如果你看见一个医生从某一家出来, 你就可以推知这家有人病了.

5. We will now deduce the properties of a single element.

现在我们推导单个无素的性质.

【induce, deduce, reduce】
这是一组形近易混词。
induce: v.引诱，劝；引起，导致。
• We couldn't induce the old lady to travel by air. 我们无法劝说那位老太太坐飞机去。
deduce: v.推断，推理，演绎。
• My friend becomes quiet when his girlfriend is angry with him; today he is quiet and so I deduce she is angry. 我的朋友在他的女朋友生他的气的时候就会变得沉默，今天他很沉默，所以我推断她生气了。
reduce: v.减轻，减小；降低。
• He reduced his weight by 20 pounds by eating less and exercising. 他通过节食和运动，体重减轻了20磅。

【conclude, judge, gather, infer, deduce】
这组词都有“推断”的意思，其区别是：
conclude: 指得出符合逻辑的结论。
judge: 多指经过仔细鉴定或评价之后作出决断。
gather: 指从听到的情况推测、判定。
infer: 指从已提供的论据或从已接受的前提出发而推断出的结论。
deduce: 指有充分根据的推论，也指逻辑学上的演绎。