以下这些形容词均有"急切的，渴望的" 的意思
anxious ：强调因忧虑、关注或害怕而产生的急切心情。
eager ：侧重于急于成功的迫切心情。
keen ：强调因兴趣强烈或欲望而急于做某事。
以下这些形容词均有"锐利的，敏锐的，机敏的" 的意思
keen：多指对复杂艰深的事物或问题有敏锐的观察和敏捷的理解。
acute：侧重感觉敏锐，能分辨出一般人难以觉察的细微区别。
sharp：指人头脑精明、敏锐或机警。
shrewd：指有头脑，善于判断分析，精明过人。

词组

keen on
热衷于有兴趣的
(as) keen as mustard
(Brit. informal)extremely eager or enthusiastic (英，非正式)极热心的，极热切的；极热情的

英语四级真题

Waiters, keen observers of humanity that they are, are catching on to this; in one poll, a full 30% said they didn't believe the job they did had any impact on the tips they received.
出自-2016年12月阅读原文
His keen interest in designing elegant and user-friendly gadgets.
出自-2012年12月阅读原文
it had keen moved to the next block.
出自-2012年6月听力原文

英语六级真题

Middle school is a crucial period when students may become keenly interested in advanced mathematics.
出自-2017年6月阅读原文
I suspect that some experts in the field will be keen to address alternative explanations, such as unassessed variables playing a role in the well-being decline.
2019年12月六级真题（第一套）阅读 Section B
Now some experts are proposing that we should take advantage of the teen brain's keen sensitivity to the presence of friends and leverage it to improve education.
2018年6月六级真题(第二套)阅读 Section B

柯林斯高阶英汉双解学习词典释义

ADJ-GRADED

渴望的；热切的；热衷的

If you are keen on doing something, you very much want to do it. If you are keen that something should happen, you very much want it to happen.
例句
You're not keen on going, are you?... 你不太想去，是吗？ Both companies were keen on a merger... 两家公司都很想合并。
ADJ-GRADED

（对…）喜爱的，满怀热情的

If you are keen on something, you like it a lot and are very enthusiastic about it.
例句
I got quite keen on the idea... 我对这个想法燃起了极大的热情。 I wasn't too keen on physics and chemistry. 我对物理和化学不是太感喜爱。
ADJ-GRADED

(对某一活动)热情的，热心的

You use keen to indicate that someone has a lot of enthusiasm for a particular activity and spends a lot of time doing it.
例句
She was a keen amateur photographer. 她是业余摄影爱好者。
ADJ-GRADED

(人)生性热情的，兴趣广博的

If you describe someone as keen, you mean that they have an enthusiastic nature and are interested in everything that they do.
例句
He's a very keen student and works very hard... 他是个很好学的学生，学习非常努力。 You're all very keen. 你们都很热心。
ADJ-GRADED

（兴趣或感情）浓厚的，强烈的

A keen interest or emotion is one that is very intense.
例句
He had retained a keen interest in the progress of the work. 他对那项工作的进展一直很关心。 ...his keen sense of loyalty. 他强烈的忠诚感
ADJ-GRADED

（支持）热情的，积极的

If you are a keen supporter of a cause, movement, or idea, you support it enthusiastically.
例句
He's been a keen supporter of the Labour Party all his life... 他一生都是工党的热情拥护者。 He is a keen advocate of park-and-ride schemes. 他是“停车再换乘”计划的热情拥护者。
ADJ-GRADED

思维敏捷的；机灵的；机智的

If you say that someone has a keen mind, you mean that they are very clever and aware of what is happening around them.
例句
They described him as a man of keen intellect... 他们把他描述成一个才思敏捷的人。 Mr Walsh has a keen appreciation of the priorities of the electorate... 沃尔什先生深刻理解选民最为关注的事项。
ADJ-GRADED

（目光或听觉）灵敏的，敏锐的

If you have a keen eye or ear, you are able to notice things that are difficult to detect.
例句
...an amateur artist with a keen eye for detail... 对细节非常敏感的业余画家 Brand's keen ear caught the trace of an accent. 布兰德敏锐的耳朵听出了口音。
ADJ-GRADED

（对某人）倾心的,迷恋的

If you are keen on someone, you find them sexually attractive and want to get to know them better.
例句
Mick has always been very keen on Carla. 米克一直迷恋卡拉。
ADJ-GRADED

（战斗或竞争）激烈的，紧张的

A keen fight or competition is one in which the competitors are all trying very hard to win, and it is not easy to predict who will win.
例句
There is expected to be a keen fight in the local elections. 预计地方选举的竞争会非常激烈。
ADJ-GRADED

（价格）低廉的，有竞争力的

Keen prices are low and competitive.
例句
The company negotiates very keen prices with their suppliers. 该公司通过讨价还价从供货商那里拿到了很低的价格。
VERB

（为死者）恸哭，哀号

If someone keens, they cry out or make sounds to express their sorrow at someone's death.
例句
He tossed back his head and keened... 他仰天恸哭起来。 Someone was making a low, keening noise. 有人正在低声哀泣。
PHRASE

对…十分热衷；对…非常热情

If you say that someone is mad keen on something, you are emphasizing that they are very enthusiastic about it.
例句
So you're not mad keen on science then?... 那么你对科学并不是太感兴趣了？ She was mad keen to go. 她非常想去。

英汉词典释义

adj.
锋利的
This knife is very keen. 这把小刀非常锋利。
热衷的, 热心的,热切的, 渴望(做某事)
He is not very keen on jazz. 他对爵士音乐不太感兴趣。 The boy is keen to go to sea. 这孩子很想去航海。 The parents were keen that their daughter should become musician. 父母渴望他们的女儿成为音乐家。
激烈的, 紧张的
良好的; 敏锐的, 灵敏的,敏捷的
She has a keen mind. 她头脑机敏。 My daughter is keen of hearing. 我的女儿听觉灵敏。
热情的，热心的；喜爱，（对…）着迷，有兴趣；思维敏捷的，机灵的，机智的；强烈的，浓厚的，深厚的；低廉的，有竞争力的；寒冷刺骨的；锐利的，锋利的
vi.
（为死者）恸哭，哀号

英英词典释义

Noun
1. a funeral lament sung with loud wailing
Verb
1. express grief verbally;
"we lamented the death of the child"
Adjective
1. having or demonstrating ability to recognize or draw fine distinctions;
"an acute observer of politics and politicians""incisive comments""icy knifelike reasoning""as sharp and incisive as the stroke of a fang""penetrating insight""frequent penetrative observations"
2. intense or sharp;
"suffered exquisite pain""felt exquisite pleasure"
3. very penetrating and clear and sharp in operation;
"an incisive mind""a keen intelligence""of sharp and active intellect"
4. very good;
"he did a bully job""a neat sports car""had a great time at the party""you look simply smashing"
5. as physically painful as if caused by a sharp instrument;
"a cutting wind""keen winds""knifelike cold""piercing knifelike pains""piercing cold""piercing criticism""a stabbing pain""lancinating pain"
6. having a sharp cutting edge or point;
"a keen blade"

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