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NUM
（數字）1
One is the number 1.
例句
They had three sons and one daughter.
他們有3個兒子，1個女兒。
...one thousand years ago...
1,000年前
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ADJ
唯一的；僅有的
If you say that someone or something is the one person or thing of a particular kind, you are emphasizing that they are the only person or thing of that kind.
例句
They had alienated the one man who knew the business...
他們弄僵了同那個唯一懂行的人之間的關系。
His one regret is that he has never learned a language.
他唯一的遺憾是從未學過一門外語。
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DET
（用于代替a以強調之后的名詞）
One can be used instead of 'a' to emphasize the following noun.
例句
There is one thing I would like to know—What is it about Tim that you find so irresistible?...
有一件事我很想知道——蒂姆到底哪一點讓你對他如此傾心？
One person I hate is Russ.
讓我討厭的一個人是拉斯。
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DET
（用于代替a以強調之后的形容詞或短語）
You can use one instead of 'a' to emphasize the following adjective or expression.
例句
If we ever get married we'll have one terrific wedding...
如果我們哪一天結婚的話，一定會有一個棒極了的婚禮。
It's like one enormous street carnival here.
這就像是一場盛大的街頭狂歡節。
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DET
（用于人名前，表示未曾相識或聽聞的）某一個
You can use one in front of someone's name to indicate that you have not met them or heard of them before.
例句
It seems that the fifth man is one John Cairncross.
第五位好像是一個名叫約翰·凱恩克羅斯的人。
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DET
（表示與其他的作比較）這一個
You can use one to refer to the first of two or more things that you are comparing.
例句
Prices vary from one shop to another...
各家商店價格不同。
The road hugs the coast for hundreds of miles, the South China Sea on one side, jungle on the other.
這條路依傍海岸綿延數百英里，一邊是南中國海，另一邊則是叢林。
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PRON
（用于代替名詞，指代某類明確的人或事物）
You can use one or ones instead of a noun when it is clear what type of thing or person you are referring to and you are describing them or giving more information about them.
例句
They are selling their house to move to a smaller one...
他們正打算賣掉房子，然后搬到一個小一點的住處。
We test each one to see that it flies well.
我們對每架飛機都會進行測試，以確保其飛行性能良好。
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PRON
（泛指）人們
You use ones to refer to people in general.
例句
We are the only ones who know.
我們是唯一的知情者。
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PRON
（用于代替名詞詞組，表示剛提到過的事物）
You can use one instead of a noun group when you have just mentioned something and you want to describe it or give more information about it.
例句
His response is one of anger and frustration...
他的回答充滿了憤怒和懊喪。
The issue of land reform was one that dominated Hungary's parliamentary elections.
土地改革是左右匈牙利議會選舉的主要問題。
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DET
（特指一群人或事物中的）一人，一個
You can use one when you have been talking or writing about a group of people or things and you want to say something about a particular member of the group.
例句
'A college degree isn't enough', said one honors student.
“光有一個大學學位還不夠，”一位優等生說。
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QUANT
（同類事物或人中）（最…之）一
You use one in expressions such as 'one of the biggest airports' or 'one of the most experienced players' to indicate that something or someone is bigger or more experienced than most other things or people of the same kind.
例句
Subaru is one of the smallest Japanese car makers.
斯巴魯是日本最小的汽車制造商之一。
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DET
（過去或將來的）某一（時刻）
You can use one when referring to a time in the past or in the future. For example, if you say that you did something one day, you mean that you did it on a day in the past.
例句
How would you like to have dinner one night, just you and me?...
哪天晚上一起吃飯怎么樣？就咱倆。
Then one evening Harry phoned, asking me to come to their flat as soon as possible.
后來一天晚上哈里打電話來，叫我盡快到他們的公寓去。
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PRON
（指代問題、笑話、評論、討論的主題等）一個
You can use one to refer to a question, joke, remark, or subject of discussion.
例句
This is a tricky one to answer...
這是個難以回答的問題。
Have you heard the one about the Irishman, the Englishman and the American?...
你聽過那個關于愛爾蘭人、英國人和美國人的笑話嗎？
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PRON
(一杯)酒
You can use one to refer to an alcoholic drink.
例句
Other members of the committee drifted in for a quick one before closing time.
委員會的其他成員陸續走了進來，想要趁關門前喝上一杯。
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PRON
（泛指包括自己的人，可作句子的主語或賓語）一個人，任何人
You use one to make statements about people in general which also apply to themselves. One can be used as the subject or object of a sentence.
例句
If one looks at the longer run, a lot of positive things are happening...
如果把目光放長遠些，就會發現很多積極的事情正在發生。
Where does one go from there?...
從那里可以去什么地方？
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PHRASE
一起；一致地
If a group of people does something as one, all the people do the same thing at the same time or in the same way.
例句
The 40,000 crowd rose as one.
40,000人全體起立。
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PHRASE
喜歡（或贊成、樂于）…的人
If you say that someone is one for or is a one for something, you mean that they like or approve of it or enjoy doing it.
例句
I'm not one for political discussions...
我不是個熱衷于談論政治的人。
She was a real one for flirting with the boys.
她是個情場高手。
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PHRASE
（強調某人與眾不同的反應或行為方式）舉個例說
You can use for one to emphasize that a particular person is definitely reacting or behaving in a particular way, even if other people are not.
例句
I, for one, hope you don't get the job.
就我而言，我并不希望你得到那份工作。
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PHRASE
（表示強調）很多
You can use expressions such as a hundred and one ,a thousand and one, and a million and one to emphasize that you are talking about a large number of things or people.
例句
There are a hundred and one ways in which you can raise money.
籌錢的辦法有很多。
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PHRASE
集（若干部分或功能）為一體
You can use in one to indicate that something is a single unit, but is made up of several different parts or has several different functions.
例句
...a love story and an adventure all in one...
集愛情和冒險于一體的故事
This cream moisturises and repairs in one.
這種護膚霜兼具滋潤和修復功能。
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PHRASE
三三兩兩地；零零落落地
You can use in ones and twos to indicate that people do things or something happens gradually and in small groups.
例句
They lose interest and start drifting away in ones and twos.
他們沒了興趣，開始三三兩兩地走開了。
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PHRASE
一個接一個地；接連地；陸續地
You use one after the other or one after another to say that actions or events happen with very little time between them.
例句
My three guitars broke one after the other...
我的3把吉他陸續都壞了。
One after another, people described how hard it is for them to get medical care.
人們一個接一個地講述獲得醫療保健服務對于他們是何其困難。
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PHRASE
（用于節目中介紹演員、歌手或其他名人）絕無僅有的，獨一無二的
The one and only can be used in front of the name of an actor, singer, or other famous person when they are being introduced on a show.
例句
...one of the greatest ever rock performers, the one and only Tina Turner.
史上最偉大的搖滾樂手之一，舉世無雙的蒂娜·特納
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PHRASE
逐個地；依次地
You can use one by one to indicate that people do things or that things happen in sequence, not all at the same time.
例句
We went into the room one by one...
我們挨個兒走進房間。
One by one the houses burst into flames.
房子一幢接一幢地燃起熊熊大火。
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PHRASE
（一組事物或人之中的）或者這個或者那個，有一個
You use one or other to refer to one or more things or people in a group, when it does not matter which particular one or ones are thought of or chosen.
例句
One or other of the two women was wrong.
這兩個女人當中有一個人錯了。
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PHRASE
一兩個；幾個
One or two means a few.
例句
We may make one or two changes...
我們可以作一兩處改動。
I've also sold one or two to an American publisher...
我還賣了幾本給一位美國出版商。
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PHRASE
不大可能（做…)的人
If you say that someone is not one to do something, you think that it is very unlikely that they would do it because it is not their normal behaviour.
例句
I'm not one to waste time on just anyone.
我可不是個隨便浪費時間在任何人身上的人。
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PHRASE
略勝…一籌；占…的上風
If you try to get one up on someone, you try to gain an advantage over them.
例句
...the competitive kind who will see this as the opportunity to be one up on you.
具有競爭意識、將此視作占據上風的契機的那種人
Noun
1. the smallest whole number or a numeral representing this number;
"he has the one but will need a two and three to go with it""they had lunch at one"2. a single person or thing;
"he is the best one""this is the one I ordered"Adjective
1. used of a single unit or thing; not two or more;
"`ane' is Scottish"2. particular but unspecified;
"early one evening"3. having the indivisible character of a unit;
"a unitary action""spoke with one voice"4. of the same kind or quality;
"two animals of one species"5. used informally as an intensifier;
"that is one fine dog"6. indefinite in time or position;
"he will come one day""one place or another"7. being the single appropriate individual of a kind; only;
"the one horse that could win this race""the one person I could marry"8. being one in number--a single unit or thing;
"one person is going""her one thought was to win""I'm just one player on the team""one day is just like the next""seen one horse and you've seen them all"9. being a single entity made by combining separate components;
"three chemicals combining into one solution"10. eminent beyond or above comparison;
"matchless beauty""the team's nonpareil center fielder""she's one girl in a million""the one and only Muhammad Ali""a peerless scholar""infamy unmatched in the Western world""wrote with unmatchable clarity""unrivaled mastery of her art"