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ADJ-GRADED
渴望的；熱切的；熱衷的
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，是嗎？
Both companies were keen on a merger...
兩家公司都很想合并。
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ADJ-GRADED
（對…）喜愛的，滿懷熱情的
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...
我對這個想法燃起了極大的熱情。
I wasn't too keen on physics and chemistry.
我對物理和化學不是太感喜愛。
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ADJ-GRADED
(對某一活動)熱情的，熱心的
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.
她是業余攝影愛好者。
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ADJ-GRADED
(人)生性熱情的，興趣廣博的
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...
他是個很好學的學生，學習非常努力。
You're all very keen.
你們都很熱心。
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ADJ-GRADED
（興趣或感情）濃厚的，強烈的
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.
他對那項工作的進展一直很關心。
...his keen sense of loyalty.
他強烈的忠誠感
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ADJ-GRADED
（支持）熱情的，積極的
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...
他一生都是工黨的熱情擁護者。
He is a keen advocate of park-and-ride schemes.
他是“停車再換乘”計劃的熱情擁護者。
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ADJ-GRADED
思維敏捷的；機靈的；機智的
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...
他們把他描述成一個才思敏捷的人。
Mr Walsh has a keen appreciation of the priorities of the electorate...
沃爾什先生深刻理解選民最為關注的事項。
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ADJ-GRADED
（目光或聽覺）靈敏的，敏銳的
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...
對細節非常敏感的業余畫家
Brand's keen ear caught the trace of an accent.
布蘭德敏銳的耳朵聽出了口音。
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ADJ-GRADED
（對某人）傾心的,迷戀的
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.
米克一直迷戀卡拉。
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ADJ-GRADED
（戰斗或競爭）激烈的，緊張的
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.
預計地方選舉的競爭會非常激烈。
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ADJ-GRADED
（價格）低廉的，有競爭力的
Keen prices are low and competitive.
例句
The company negotiates very keen prices with their suppliers.
該公司通過討價還價從供貨商那里拿到了很低的價格。
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VERB
（為死者）慟哭，哀號
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...
他仰天慟哭起來。
Someone was making a low, keening noise.
有人正在低聲哀泣。
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PHRASE
對…十分熱衷；對…非常熱情
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?...
那么你對科學并不是太感興趣了？
She was mad keen to go.
她非常想去。