1
keen on sth / doing sth
用于表达对某事有强烈兴趣或渴望。
She is keen on learning French.
她热衷于学习法语。
渴望的；热衷的
keenest — superlative of keen
先理解核心含义，再看它在真实句子里的用法。
渴望的；热衷的
showing a quick and ardent responsiveness or willingness; eager, enthusiastic, interested
She is keen on learning French.
她热衷于学习法语。
渴望的；热衷的
Often with a prepositional phrase, or with to and an infinitive: showing a quick and ardent responsiveness or willingness; eager, enthusiastic, interested.
激烈的；强烈的；猛烈的
Fierce, intense, vehement.
有锐利边缘或尖端的；锋利的
Having a fine edge or point; sharp.
头脑敏锐的；有洞察力的；尖锐的
Acute of mind, having or expressing mental acuteness; penetrating, sharp.
She is keen to learn Chinese before her trip to Beijing.
她渴望在去北京之前学中文。
He's very keen on playing tennis at the weekend.
他非常热衷于周末打网球。
The whole team is keen to get started on the new project.
整个团队都渴望开始新项目。
用于表达对某事有强烈兴趣或渴望。
She is keen on learning French.
她热衷于学习法语。
用于表达做某事的强烈意愿。
He is keen to join the team.
他渴望加入这个团队。
Not this
She is keen in playing tennis.
Use this
She is keen on playing tennis.
表示‘热衷于’时，应为 keen on + 名词/动名词，而非 keen in。
Not this
I am keen on to learn English.
Use this
I am keen to learn English.
表示‘渴望做某事’时，用 keen to + 动词原形；keen on 后接名词或动名词，不能接 to do。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
浓厚的兴趣
She has a keen interest in astronomy.
她对天文学有浓厚的兴趣。
敏锐的观察
His keen observation helped solve the mystery.
他敏锐的观察力帮助解开了谜团。
敏锐的感觉
Dogs have a keen sense of smell.
狗有敏锐的嗅觉。
锋利的刀刃
The knife has a keen edge.
这把刀刀刃锋利。
激烈的竞争
There is keen competition for the scholarship.
奖学金的竞争很激烈。
强烈的愿望
He expressed a keen desire to learn Chinese.
他表达了学习中文的强烈愿望。
非常热情；极为敏锐
She is keen as mustard about learning Chinese.
她学习中文的热情极高。
敏锐的眼光
A good editor has a keen eye for detail.
好编辑对细节有敏锐的眼光。
热衷于；喜爱
He is keen on playing basketball.
他热衷于打篮球。
发长 /iː/ 音 (如 see, free)
Use keenest naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象一只鹰用锐利的眼睛（keen eyes）寻找猎物，记住keen就是‘锐利的、敏锐的’。
语域：neutral 常见场景：谈论兴趣或渴望、正式或非正式对话 通常用于形容强烈的兴趣或渴望，在口语和书面语中都很常见。
常用于短语'keen on'表示'喜爱'；'keen to'表示'渴望'。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.