名詞 one:

1. the smallest whole number or a numeral representing this number
   同義詞：1, I, ace, single, unity
2. a single person or thing

形容詞 one:

1. used of a single unit or thing; not two or more
   同義詞：1, i, ane
2. having the indivisible character of a unit
   同義詞：unitary
3. of the same kind or quality
4. used informally as an intensifier
5. indefinite in time or position
6. being a single entity made by combining separate components
7. eminent beyond or above comparison
   同義詞：matchless, nonpareil, one and only, peerless, unmatched, unmatchable, unrivaled, unrivalled

1. One should do his best for the cause of world peace.
   一個(gè)人應(yīng)該為世界和平事業(yè)盡最大努力。
2. A person has one head and one neck.
   每人都有一個(gè)頭，一個(gè)脖子。
3. If only problems would come one at a time!
   要是問(wèn)題一次只發(fā)生一個(gè)該多好！

one

adj.（形容詞）
Being a single entity, unit, object, or living being; not two or more.
一個(gè)的，單一的：是一個(gè)實(shí)體、單元、物體或生物的；而不是兩個(gè)或者更多
Characterized by unity; undivided:
同一的，整體的：以整體性為特點(diǎn)的，不可分的：
例句：
They spoke with one voice.
他們異口同聲

Of the same kind or quality:
同一種類的，同一性質(zhì)的：
例句：
two animals of one species.
同一種類的兩個(gè)動(dòng)物

Forming a single entity of two or more components:
單一實(shí)體的：由兩個(gè)或更多個(gè)要素形成的一個(gè)單一實(shí)體：
例句：
three chemicals combining into one solution.
三種化合物溶成一種溶液

Being a single member or element of a group, category, or kind:
一個(gè)成員的，一個(gè)要素的：成為一組、一個(gè)部門或一個(gè)種類中的一員或一個(gè)要素的：
例句：
I`m just one player on the team.
我只是這個(gè)球隊(duì)中的一名球員

Being a single thing in contrast with or relation to another or others of its kind:
（與其它同類東西）相同的：與同類中另一個(gè)或其它的相對(duì)或相關(guān)的一種事物：
例句：
One day is just like the next.
每天都一樣

Occurring or existing as something indefinite, as in time or position:
某一（時(shí)間或事物）：在某一不確定的時(shí)間發(fā)生或出現(xiàn)的，如在時(shí)間或位置上：
例句：
He will come one day.
他總有一天會(huì)來(lái)

Occurring or existing as something particular but unspecified, as in time past:
（過(guò)去的時(shí)間）某一特定的：如某特殊事物的出現(xiàn)或存在，如過(guò)去的時(shí)間：
例句：
late one evening.
某一個(gè)深

Informal Used as an intensive:
【非正式用語(yǔ)】 用來(lái)加強(qiáng)語(yǔ)氣：
例句：
That is one fine dog.
這是一條不錯(cuò)的狗

Being the only individual of a specified or implied kind:
特定的：是特定或暗指的種類中的唯一個(gè)體：
例句：
the one person I could marry; the one horse that can win this race.
我唯一愿嫁的人；唯一能贏得這次比賽的馬

n.（名詞）
The cardinal number, represented by the symbol , designating the first such unit in a series.
一：基數(shù)，用符號(hào)表示，代表一系列中這樣的單元中的第一個(gè)
A single person or thing; a unit:
一個(gè)：一個(gè)人或物，一個(gè)單元：
例句：
This is the one I like best.
這是我最喜歡的一個(gè)

pron.（代詞）
An indefinitely specified individual:
某人：
例句：
She visited one of her cousins.
她去拜訪了一位表親

An unspecified individual; anyone:
未指明的人；任何一個(gè)人：
例句：
.The older one grows the more one likes indecency.(Virginia Woolf)
.人愈老愈喜歡粗鄙的言行.(弗吉尼亞·沃爾夫)

<習(xí)慣用語(yǔ)>at one
In accord or unity.
一致，合力
one and all
Everyone.
每個(gè)人，全體
one by one
Individually in succession.
一個(gè)接一個(gè)
來(lái)源：
Middle English on
中古英語(yǔ) on
from Old English 3n * see oi-no-
源自 古英語(yǔ) 3n *參見(jiàn) oi-no-

When constructions headed byone appear as the subject of a sentence or relative clause, there may be a question as to whether the verb should be singular or plural.Such a construction is exemplified in the sentenceOne of every ten rotors was found defective. Although the pluralwere is sometimes used in such sentences, an earlier survey found that the singular was preferred by a large majority of the Usage Panel. ·Another problem is raised by constructions such asone of those people who or its variants. In the sentenceThe defeat turned out to be one of the most costly blows that were ever inflicted on our forces, most grammarians would hold that the pluralwere is correct, in as much as the subject of the verb is the plural nounblows. However, constructions of this sort are often used with a singular verb even by the best writers.Note also that when the phrase containingone is introduced by the definite article, the verb in the relative clause must be singular:
當(dāng)以one 開(kāi)頭的結(jié)構(gòu)作為一個(gè)句子或關(guān)系從句的主語(yǔ)出現(xiàn)時(shí)， 就出現(xiàn)動(dòng)詞用單數(shù)還是復(fù)數(shù)的問(wèn)題，如用在句子每十個(gè)轉(zhuǎn)子中有一個(gè)為次品 中的這種結(jié)構(gòu)。 雖然復(fù)數(shù)were 有時(shí)用在這種句子中， 但在一次早期的調(diào)查發(fā)現(xiàn)用法專題使用小組的大部分成員更傾向于用單數(shù)。另一個(gè)問(wèn)題是由象one of those people who 這樣的結(jié)構(gòu)及其變化引起的。 在句子The defeat turned out to be one of the most costly blows that were ever inflicted on our forces, 中, 大多數(shù)語(yǔ)法學(xué)家主張用復(fù)數(shù)were 是正確的， 以及主要是由于動(dòng)詞的主語(yǔ)是復(fù)數(shù)名詞blow 所致。 然而，這種結(jié)構(gòu)常與單數(shù)動(dòng)詞連用，甚至被很有聲望的作家采用。也要注意當(dāng)包含one 的短語(yǔ)被定冠詞限制時(shí)， 相關(guān)的從句中的動(dòng)詞一定要用單數(shù)：
例句：
He is the only one of the students who has (not have ) already taken Latin. See Usage Note at he
他是這些學(xué)生中唯一一個(gè)（不用 have ) 曾學(xué)過(guò)拉丁語(yǔ)的人。 參見(jiàn) he