If you are being deductive, you use the knowledge and information you already have, and from that you work out what something means, or form an opinion. You are not guessing in the dark, and you are not rushing out to gather a whole new pile of examples first; you start from what is in your hand.

If you are being deductive如果你是deductive（有推理性）的 you use the knowledge and information you already have你會用你已經有的知識和資訊 and from that you work out what something means, or form an opinion然後從那裡推論出某件事的意思，或形成看法 You are not guessing in the dark你不是在瞎猜 and you are not rushing out to gather a whole new pile of examples first也不是先急著跑去蒐集一大堆新的例子 you start from what is in your hand你是從手邊已經有的東西開始

In school this word often sits beside inductive: inductive thinking walks from many small cases up toward a general idea, and deductive thinking walks the other way, from a rule or a set of facts down to a conclusion about one case.

In school this word often sits beside inductive在學校裡，這個字常常跟inductive（歸納的）擺在一起 inductive thinking walks from many small cases up toward a general idea歸納式思考是從很多小案例走向一個大概念 and deductive thinking walks the other way而演繹式思考則是反方向走 from a rule or a set of facts down to a conclusion about one case從一個規則或一組事實，推到關於某一個案例的結論

Though actually, outside the logic classroom people also call it deductive when someone is simply good at putting clues together, the way a detective does — that everyday use is looser than the tidy school contrast.

Though actually不過其實 outside the logic classroom people also call it deductive在邏輯課堂之外，大家也會把某人叫做deductive when someone is simply good at putting clues together只要他很會把線索拼湊起來 the way a detective does就像偵探那樣 that everyday use is looser than the tidy school contrast這種日常用法比學校那種工整的對比要鬆散

It is a serious, somewhat formal adjective. You will meet it in phrases like deductive reasoning or deductive skills; friends almost never say “that was deductive of you” in ordinary chat.

It is a serious, somewhat formal adjective這是一個嚴肅、有點正式的形容詞 You will meet it in phrases like deductive reasoning or deductive skills你會在deductive reasoning（演繹推理）或deductive skills（演繹能力）這類詞組裡看到它 friends almost never say "that was deductive of you" in ordinary chat朋友平常聊天幾乎不會說「that was deductive of you」這種話