1. producing the intended result
有效的，能產生預期結果的
The new marketing strategy proved to be very effective.
新的行銷策略證明非常有效。
This medicine is effective against most common infections.
這種藥物對大多數常見感染都有效。
Effective Meaning（定義、用法、例句與發音）
effective
adjective
快速理解
What does "Effective" mean?What are 2-3 core uses of "Effective"?
形容能成功產生預期結果或實際起作用的狀態。
- 1
有效的
EN: producing the intended result
翻譯: 能產生預期效果的
- 2
實際生效的
EN: in operation or in effect
翻譯: 已開始實施或運作的
- 3
給人深刻印象的
EN: making a striking impression
翻譯: 能給人留下深刻印象的
- 4
實際可用的
EN: available for service or action
翻譯: 實際可用於服務或行動的
小提醒：注意 'effective' 與 'efficient'（高效率的）不同，前者強調「有效果」，後者強調「有效率、省時省力」。
發音（How to Pronounce "Effective" in English）
How to pronounce "Effective" in English?"Effective" US vs UK pronunciation
點擊下方的 US / UK 按鈕可播放發音。
Real-life Examples of "Effective" from YouTube Videos
South Korea would accept Trump-Kim deal to freeze North Korea’s nuclear programme | BBC News
BBC News
“>>. We don't think these broadcasts are very effective and the cost is high because they tend to increase North Korea's hostility towards us.”
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Definitions（定義）
What are the definitions of "Effective"?How does "Effective" change by context?
2. in operation; actual
生效的，實際運作的
The new law will become effective next month.
新法律將於下個月生效。
The effective date of the contract is January 1st.
合約的生效日期是1月1日。
3. impressive or striking
給人深刻印象的，顯著的
The lighting created an effective atmosphere in the room.
燈光在房間裡營造出令人印象深刻的氛圍。
She gave an effective presentation that convinced the entire board.
她做了一場極具說服力的簡報，說服了整個董事會。
4. adequate to accomplish a purpose
足以達成目的的，夠用的
We need to find an effective solution to this problem.
我們需要找到一個足以解決這個問題的有效方案。
The team took effective measures to prevent data loss.
團隊採取了足夠的措施來防止數據丟失。
Grammar & Patterns（句型）
What are common sentence patterns for "Effective"?How to make natural sentences with "Effective"?
| Pattern | Meaning | Example |
|---|---|---|
| effective + noun | 有效的… | The company implemented an **effective** strategy to increase sales. (公司實施了一項**有效的**策略來增加銷售。) |
| effective + against + noun | 對…有效 | This new drug is highly **effective** against the virus. (這種新藥對該病毒非常**有效**。) |
| effective + in + V-ing | 在…方面有效 | She was remarkably **effective** in managing the crisis. (她在處理危機方面非常**有效**。) |
| effective + at + V-ing | 擅長於… | He is very **effective** at communicating complex ideas. (他非常**擅長**傳達複雜的概念。) |
| effective + from + date/time | 自…起生效 | The new policy will be **effective** from January 1st. (新政策將自1月1日起**生效**。) |
| effective + for + purpose/period | 對…目的/期間有效 | This coupon is **effective** for a limited time only. (此優惠券僅在限定時間內**有效**。) |
| make + something + effective | 使…生效/有效 | The manager took steps to make the new rules **effective**. (經理採取措施使新規定**生效**。) |
| be + most/very/highly + effective | 非常/極其有效 | Early intervention has proven to be **most effective**. (早期介入已被證明是**最有效的**。) |
| cost-effective | 符合成本效益的 | We need to find a **cost-effective** solution. (我們需要找到一個**符合成本效益的**解決方案。) |
| become + effective | 變得有效；生效 | The law will **become effective** after the president signs it. (該法律將在總統簽署後**生效**。) |
用法說明
How is "Effective" different from similar structures?What usage mistakes are common with "Effective"?
effective in doing vs. effective to do
- effective in doing 強調在「某個過程或活動中」有效。介系詞
in後面通常接動名詞 (V-ing) 或名詞，指出有效的領域或情境。 - effective to do 強調「為了達成某個特定目的」而採取的行動是有效的。這種結構較不常見，且聽起來較為正式或書面化。
- 在描述「方法、策略、工具」的有效性時，effective in doing 是更自然、更常用的選擇。
- 當句子以
It is effective to...開頭，引導出一個目的時，會使用 effective to do。 EN: This software is effective in blocking malicious websites. 翻譯: 這款軟體在阻擋惡意網站方面很有效。
EN:It is effective to use strong passwords to protect your accounts.
翻譯:使用強密碼來保護帳戶是有效的。
總結建議
一般情況下，描述在某方面有效時，使用 effective in doing 最為自然且準確。
易混淆對比
What is the difference between "Effective" and similar words?How to choose "Effective" vs alternatives?
effective vs efficient
effective 強調達成預期結果，efficient 強調以最少資源達成結果。
effective vs productive
effective 著重效果，productive 著重產出量或成果。
effective vs successful
effective 描述方法或工具的效果，successful 描述整體結果或人的成就。
口語用法
How is "Effective" used in spoken English?What is the spoken vs formal difference for "Effective"?
引述
在口語中，當引述或轉述他人對某事物「有效」的評價時，常用此詞。 EN: He said the new software update is really effective. 翻譯: 他說新的軟體更新真的很有效。
EN:Everyone keeps telling me this method is effective, so I'll give it a try.
翻譯:大家一直跟我說這個方法很有效，所以我來試試看。
語氣強調
在對話中，為了強調效果顯著，常會加上副詞（如 really, so, incredibly）來加強語氣。 EN: This cream is so effective; my skin cleared up in just two days. 翻譯: 這個乳霜超有效，我的皮膚兩天就變好了。
EN:I need to find a more effective way to manage my time.
翻譯:我得找一個更有效的方法來管理時間。
停頓填充
在思考或組織語句時，有時會用「effective」作為一個填充詞，引出具體說明。 EN: The strategy was... effective, but it took a lot of resources to implement. 翻譯: 這個策略嘛…是有效，但執行起來耗費很多資源。
EN:It's an effective... well, let's call it a temporary solution.
翻譯:這是一個有效的…嗯，我們姑且稱之為暫時的解決方案。
注意：在正式寫作（如學術報告、商業提案）中，應避免使用過於口語的強調詞（如 "so effective"），建議改用 "highly effective"、"remarkably effective" 或 "proved to be effective" 等更正式的表述。
常見短語
What common collocations use "Effective"?What fixed phrases with "Effective" should I remember?
effective immediately
effective + adverb (of time)
立即生效
highly effective
adverb + effective
非常有效
cost-effective
compound adjective
符合成本效益的
effective way
effective + noun
有效的方法
effective date
effective + noun
生效日期
make something effective
verb + something + effective
使某事物生效/有效
effective against
effective + preposition
對...有效
become effective
verb + effective
開始生效
常見錯誤
What are common mistakes with "Effective"?Which "Effective" sentences look correct but are wrong?
×This new software is very effective in energy consumption.
✓This new software is very efficient in energy consumption.
「effective」意指「有效的、達到預期效果的」，而「efficient」強調「有效率的、不浪費資源的」。描述節省能源時，應使用「efficient」。
×The effective of the medicine lasts for about six hours.
✓The effect of the medicine lasts for about six hours.
「effective」是形容詞，意為「有效的」。要表達「效果、作用」這個名詞概念，應使用「effect」。
×This technique is effective to reduce stress.
✓This technique is effective in reducing stress.
形容詞「effective」通常後接「in + V-ing」或「at + V-ing」來表示「在...方面有效」，而非「to + 動詞原形」。
×The movie had a strong effective on the audience.
✓The movie had a strong affective impact on the audience.
「effective」意為「有效的」，而「affective」是心理學術語，意為「情感的、引起感情的」。描述情感影響時，應使用「affective」或更常見的「emotional」。此處「affective impact」是正確用法。
×This is the most effectiveest solution we have.
✓This is the most effective solution we have.
「effective」的比較級和最高級是規則變化「more effective」和「most effective」，或使用「effectiver」和「effectivest」在非正式場合。不應同時使用「most」和「-est」後綴，這是冗餘且錯誤的。
×The contract is effective from January.
✓The contract is effective as of January 1st.
「effective」表示「生效的」時，通常需要一個明確的起始點。僅說「from January」不夠精確，應使用「as of + 具體日期」或「effective + 具體日期」來表達。
詞形變化
What are the word forms of "Effective"?What are tense/participle forms of "Effective"?