1. to reduce speed or slow down
降低速度，減速
The driver had to decelerate as he approached the sharp curve.
駕駛在接近急彎時必須減速。
The train began to decelerate before entering the station.
火車在進站前開始減速。
Decelerate Meaning（定義、用法、例句與發音）
decelerate
verb
快速理解
What does "Decelerate" mean?What are 2-3 core uses of "Decelerate"?
指速度或進度逐漸降低、變慢。
- 1
物理運動
EN: to reduce the speed of a moving vehicle or object
翻譯: 降低移動中的車輛或物體的速度
- 2
活動進度
EN: to cause a process or activity to happen more slowly
翻譯: 使某個過程或活動進展得更緩慢
- 3
經濟/成長
EN: to slow down the rate of economic growth or expansion
翻譯: 使經濟成長或擴張的速度放緩
小提醒：注意：decelerate 強調的是「逐漸減速」的過程，而非突然停止。其反義詞是 accelerate（加速）。
發音（How to Pronounce "Decelerate" in English）
How to pronounce "Decelerate" in English?"Decelerate" US vs UK pronunciation
點擊下方的 US / UK 按鈕可播放發音。
Real-life Examples of "Decelerate" from YouTube Videos
Charles Elachi: The story of the Mars Rovers
TED
“BC: From this point we're going to decelerate from 12,500 miles an hour. down to 900 miles an hour.”
(1 out of 1)
Definitions（定義）
What are the definitions of "Decelerate"?How does "Decelerate" change by context?
2. to cause something to happen or progress more slowly
使（某事）進展或發生得更慢
The economic crisis decelerated the company's expansion plans.
經濟危機使公司的擴張計畫放緩。
High inflation can decelerate overall economic growth.
高通貨膨脹可能減緩整體經濟增長。
3. (in physics) to undergo a decrease in velocity
（物理學中）經歷速度的降低
The particle will decelerate when it enters the magnetic field.
粒子進入磁場時會減速。
Objects in free fall decelerate due to air resistance.
自由落體中的物體會因空氣阻力而減速。
Grammar & Patterns（句型）
What are common sentence patterns for "Decelerate"?How to make natural sentences with "Decelerate"?
| Pattern | Meaning | Example |
|---|---|---|
| decelerate | 減速 | The car began to decelerate as it approached the red light. |
| decelerate + from + speed | 從某個速度開始減速 | The train decelerated from 200 km/h to a complete stop. |
| decelerate + to + speed/noun | 減速至某個速度或狀態 | The economy is decelerating to a more sustainable growth rate. |
| decelerate + adverb | 以某種方式減速 | The aircraft decelerated rapidly after touchdown. |
用法說明
How is "Decelerate" different from similar structures?What usage mistakes are common with "Decelerate"?
decelerate doing vs decelerate to do
- decelerate doing 這種結構並不自然。在標準英語中，"decelerate" 通常不直接接動名詞 (V-ing) 來表示目的或意圖。
- decelerate to do 是正確的結構，用於表達「減速是為了做某事」的目的。這裡的 "to do" 是不定詞片語，表示減速的目的或結果。
- 常見的用法是 decelerate to + 動詞原形，或使用 decelerate before + V-ing 來表示在進行某動作前先減速。
對比例句： EN: The train began to decelerate to stop at the station. 翻譯: 火車開始減速，以便在車站停下。
EN:The driver decelerated before entering the sharp curve.
翻譯:駕駛在進入急彎前先減速。
總結建議
表達「為了做某事而減速」時，應使用 "decelerate to + 動詞原形" 的結構。
易混淆對比
What is the difference between "Decelerate" and similar words?How to choose "Decelerate" vs alternatives?
decelerate vs slow down
「decelerate」較為正式、技術性，通常指速度或進程的系統性降低；「slow down」則為日常用語，泛指任何形式的減速或放緩。
decelerate vs brake
「decelerate」泛指降低速度的過程或狀態；「brake」特指透過煞車裝置或類似動作來達成減速。
decelerate vs retard
兩者皆可指減速，但「retard」在技術領域外已不常用，且可能帶有冒犯性；「decelerate」為中性且通用的術語。
口語用法
How is "Decelerate" used in spoken English?What is the spoken vs formal difference for "Decelerate"?
引述
在口語中，當引述或轉述他人的指令或建議時，常用 decelerate 來表達「放慢速度」的正式說法。
EN: The instructor kept saying, "You need to decelerate before the turn."
翻譯: 教練不斷地說：「你必須在轉彎前減速。」
EN:My dad's advice was always, "Decelerate gradually, don't just slam the brakes."
翻譯:我爸爸的建議總是：「要逐漸減速，不要猛踩煞車。」
語氣強調
為了強調減速的必要性或急迫性，說話者可能會加重 decelerate 的語氣，或搭配副詞使用。
EN: You really need to decelerate now, the exit is coming up!
翻譯: 你真的現在必須減速了，出口快到了！
EN:I'm telling you, decelerate immediately.
翻譯:我告訴你，立刻減速。
停頓填充
在組織思緒或描述過程時，decelerate 可能作為一個明確的步驟點，前面常有短暫停頓或填充詞。
EN: So then you... decelerate, and then check your mirrors.
翻譯: 所以然後你…減速，然後檢查你的後視鏡。
EN:The next thing to do is, uh, decelerate smoothly.
翻譯:接下來要做的是，呃，平穩地減速。
正式書寫注意：在極正式的學術或技術報告中，decelerate 是合適的用詞。但在一般商業郵件或非技術性文件中，使用 slow down、reduce speed 會更為自然易懂。
常見短語
What common collocations use "Decelerate"?What fixed phrases with "Decelerate" should I remember?
decelerate rapidly
verb + adverb
迅速減速
decelerate gradually
verb + adverb
逐漸減速
decelerate the vehicle
verb + noun phrase
使車輛減速
decelerate inflation
verb + noun
減緩通貨膨脹
decelerate growth
verb + noun
減緩增長
begin to decelerate
verb + to-infinitive
開始減速
decelerate to a stop
verb + prepositional phrase
減速至停止
force to decelerate
verb + to-infinitive
迫使減速
常見錯誤
What are common mistakes with "Decelerate"?Which "Decelerate" sentences look correct but are wrong?
×The car decelerated its speed.
✓The car decelerated.
"Decelerate" 本身已包含速度降低的意思，加上 "its speed" 是多餘的贅詞。
×We need to decelerate the inflation.
✓We need to slow down / reduce / curb inflation.
"Decelerate" 通常用於描述物理運動速度的降低，用於抽象概念（如通貨膨脹、經濟成長）較不自然。應使用更常見的動詞如 "slow down", "reduce", 或 "curb"。
×He decelerated to stop the car.
✓He slowed down to stop the car. / He applied the brakes to stop the car.
"Decelerate" 是一個較正式或技術性的詞彙，在日常口語中描述停車動作時，使用 "slow down" 或 "apply the brakes" 更為自然。
×The project decelerated due to lack of funding.
✓The project slowed down / lost momentum due to lack of funding.
雖然 "decelerate" 有時可比喻進展變慢，但更常見且自然的用法是 "slow down" 或 "lose momentum"。直接使用 "decelerate" 會顯得生硬。
×Please decelerate your speaking.
✓Please slow down your speech. / Please speak more slowly.
"Decelerate" 不能以 "speaking" 或 "speech" 為直接受詞。描述說話速度應使用 "slow down" 搭配 "your speech" 或直接使用副詞 "slowly"。
詞形變化
What are the word forms of "Decelerate"?What are tense/participle forms of "Decelerate"?
decelerates(3rd_singular)decelerating(present_participle)decelerated(past)decelerated(past_participle)