根據已知資訊，透過邏輯推理得出結論。
邏輯推理
EN: to reach a conclusion by reasoning from known facts or evidence
翻譯: 根據已知事實或證據，透過推理得出結論。
推斷
EN: to infer something based on available information
翻譯: 根據現有資訊推斷出某事。
演繹
EN: to derive a specific conclusion from general principles
翻譯: 從普遍原則中推導出具體結論。
小提醒：注意 'deduce' 強調的是從已知事實進行邏輯推理得出『必然』結論，而 'infer' 則更偏向於根據證據進行『推測』，結論的確定性可能較低。
點擊下方的 US / UK 按鈕可播放發音。
Real-life Examples of "Deduce" from YouTube Videos
Patricia Burchat: Shedding light on dark matter
TED
“Now, how do we deduce where the galaxy is? Well, we deduce it by the direction that the ray is traveling as it enters our eye.”
1. to reach a conclusion by reasoning from evidence or premises
根據證據或前提，透過推理得出結論
From the footprints and the broken window, the detective deduced that the burglar had entered from the back.
從腳印和破碎的窗戶，偵探推斷竊賊是從後方進入的。
We can deduce from her reaction that she already knew the news.
我們可以從她的反應推斷她已經知道這個消息了。
2. to derive or trace the origin or development of something logically
透過邏輯推導出某事物的起源或發展
Linguists have deduced the ancient language's structure by comparing its modern descendants.
語言學家透過比較其現代衍生語言，推導出了這門古老語言的結構。
Biologists deduced the evolutionary path of the species from fossil records.
生物學家從化石記錄中推導出了該物種的演化路徑。
3. to figure something out from limited information
從有限的資訊中推斷出某事
I could deduce from the empty fridge and the note that they had gone on a trip.
我可以從空蕩蕩的冰箱和那張紙條推斷他們去旅行了。
She quickly deduced the answer to the puzzle.
她很快就推斷出了這個謎題的答案。
| Pattern | Meaning | Example |
|---|---|---|
| deduce + (that) + clause | 推斷出… | From the evidence, we can deduce that he was not at the scene. (從證據中，我們可以推斷他當時不在現場。) |
| deduce + noun phrase | 推斷出… | The detective deduced the identity of the killer. (偵探推斷出了兇手的身份。) |
| deduce + noun phrase + from + noun phrase | 從…推斷出… | She deduced his true intentions from his actions. (她從他的行為推斷出了他的真實意圖。) |
| deduce + wh-clause (e.g., what, how, why) | 推斷出… | It's impossible to deduce what will happen next. (不可能推斷出接下來會發生什麼。) |
| be deduced | 被推斷出來 | The cause of the accident was deduced from the wreckage. (事故的原因從殘骸中被推斷出來。) |
deduce 後不接不定詞 (to V)。
EN: From the muddy footprints, we can deduce that someone entered the house.
翻譯: 從泥濘的腳印，我們可以推斷出有人進過屋子。EN:We can deduce the intruder's approximate height from the footprint depth.
翻譯:我們可以從腳印的深度推斷出闖入者的大致身高。
標準用法是 deduce that + 結論子句 或 deduce + 名詞 + from + 證據，應避免使用 deduce to do。
deduce vs infer
「deduce」強調從已知事實或原則進行邏輯推導得出必然結論；「infer」則更常指根據證據或跡象進行推測或詮釋，結論的必然性較低。
deduce vs conclude
「deduce」專注於推理過程本身；「conclude」則強調推理過程結束後形成的最終判斷或決定。
deduce vs derive
「deduce」側重邏輯推論出抽象結論；「derive」則常指從源頭或基礎中獲得具體事物（如公式、物質、樂趣）。
在對話中，當你轉述或總結他人的推理過程時，常用「deduce」來引述。 EN: So, from the empty parking lot and dark windows, you deduced they were closed? 翻譯: 所以，你從空蕩的停車場和漆黑的窗戶，推斷出他們已經打烊了？
EN:What I deduced from her tone was that she wasn't really interested.
翻譯:我從她的語氣推斷出，她其實沒什麼興趣。
在口語中，有時會用「deduce」來強調結論是經過仔細思考的，並非隨意猜測。 EN: Well, if the keys are inside and the door is locked, I can only deduce we're locked out. 翻譯: 嗯，如果鑰匙在裡面而門鎖著，我只能推斷我們被鎖在門外了。
EN:Looking at all the evidence, I'd deduce he's the one who ate the last cookie.
翻譯:看過所有證據，我會推斷他就是吃了最後一塊餅乾的人。
在組織思緒或尋找合適字眼時，有時會用「deduce」作為一個填充詞，帶出接下來的結論。 EN: Let me see... if the meeting is at 3 and it's 2:45 now, I deduce we should leave soon. 翻譯: 讓我想想…如果會議是三點，現在是兩點四十五，我推斷我們該馬上出發了。
EN:So, after hearing both sides, what I can deduce is... we need more information.
翻譯:所以，聽完雙方說法後，我能推斷的是…我們需要更多資訊。
正式寫作注意：在正式或學術寫作中，「deduce」是一個精確的術語，通常用於描述邏輯推理或科學論證的過程。在口語對話中，它的使用則較為靈活，可能帶有輕微的戲劇性或幽默感。在正式寫作中，應確保其使用符合嚴謹的邏輯推導語境，避免口語中隨意或填充式的用法。
deduce from
deduce something from something
從...推斷出
deduce that
deduce that + clause
推斷出...
logically deduce
logically deduce something
邏輯推導出
deduce the cause
deduce the cause (of something)
推斷出原因
deduce a solution
deduce a solution (to something)
推導出解決方案
deduce the truth
deduce the truth (about something)
推斷出真相
deduce its meaning
deduce its/their meaning
推斷出其含義
×I deduced that he is lying.
✓I deduced that he was lying.
在「deduce」後面的名詞子句中，時態通常要與主要動詞「deduced」的過去式保持一致，因此使用過去式「was」比現在式「is」更自然。
×She deduced the answer from the book.
✓She deduced the answer from the clues in the book.
「deduce」強調透過邏輯推理從已知事實或證據中得出結論。單說「from the book」不夠精確，應說明是從書中的什麼（如線索、資訊）推理出來的。
×We can deduce to solve this problem.
✓We can use deduction to solve this problem. / We can deduce the solution to this problem.
「deduce」是及物動詞，後面直接接名詞作為受詞（如「the answer」、「the truth」），或接「that」子句。它不能接不定詞「to solve」。若要表達「用推理來解決」，應使用名詞「deduction」或改變句型。
×I deduced about his intentions.
✓I deduced his intentions.
「deduce」是及物動詞，不需要介系詞「about」。直接將要推理的內容（如「his intentions」、「the meaning」）放在動詞後面即可。
×It is deduced that the theory is correct.
✓It can be deduced that the theory is correct.
在正式或學術寫作中，使用被動語態「It is deduced that...」雖然文法正確，但聽起來不自然且較少用。更常見且自然的是使用「It can be deduced that...」或「One can deduce that...」，以強調推理的可能性或過程。
×He is good at deducing.
✓He is good at deduction. / He is good at deducing things.
雖然「deducing」是動名詞，但單獨使用「deducing」作為「at」的受詞聽起來不完整且不自然。更地道的說法是使用名詞「deduction」，或在「deducing」後面加上受詞（如「things」、「patterns」）。