1 1; one less than two; a single 1, 一（个）; 单个
*I've got two brothers and one sister. 我有两个弟弟和一个妹妹.
* There's only one piece of cake left. 只剩下一块饼了.
* Book One, Chapter One, ie the first chapter of the first book 第一册, 第一章
* One of my friends lives in Brighton. 我有个朋友住在布赖顿.
* One of the girls brought her sister. 那些姑娘有一个把妹妹带来了.
2 (a) (esp of periods of time) a particular but unspecified （尤指时间的段）某一（但非特指某时间）
*one day/morning/afternoon/evening/night last week 上星期的一天[一个上午/一个下午/一个晚上/一夜]
* One day (ie At an indefinite time in the future) you'll be glad she left you. 有朝一日你就庆幸她离开了你.
* One morning in June... 六月的一个早晨....
(b) (used for emphasis and always stressed 用以加强语气, 必须重读) a particular (person or thing) 某（人或物）
*The `one way to succeed is to work hard and live a healthy life. 成功的唯一途径是勤奋及过健康的生活.
* No `one of you could lift that piano, ie Two or more of you would be needed. 你们一个人谁也抬不动那架钢琴.
3 (usu fml 通常作文雅语) (used with somebody's name to show that the speaker does not know the person 用于姓名之前表示说话者不知其人) a certain(5) 某; 某个; 某位
*One Tim Smith (Cf 参看 A Mr Smith) called to see you but you were out. 有个叫蒂姆·史密斯的来过电话找你, 你不在.
* The author of the anonymous article turned out to be one Stanley Carter. 那篇匿名文章的作者原来是个叫作斯坦利·卡特的人.
4 (used with the other, another or other(s) to show a contrast 与the other、another或other(s)连用表示对比、对照或区别)
*The two girls are so alike that strangers find it difficult to tell (the) one from the other. 那两个女孩儿像极了, 外人难以分清她们谁是谁.
* I see you add the egg before the milk. That's `one way of doing it, ie suggesting there are other and possibly better ways. 我看见你先加鸡蛋後放牛奶. 这是一种做法（言外之意, 可能有别的、更好的做法）.
* I'm sorry I can't help you. For one thing (ie As a first reason) I'm in a hurry, and for another I have a bad back. 对不起, 我帮不了忙. 一来我有急事, 二来我後背有毛病.
5 the same 同一
*They all went off in one direction. 他们都往同一方向走了.
* After the union meeting the workers were all of one mind, ie all had the same opinion. 工会开过会後, 工人们都心齐了（获得共识）.
6 (infml 口 esp US) (used instead of a or an to emphasize the n or phrase that follows it 代替a或an以强调其後的名词或词组)
*That's one handsome guy. 那是个漂亮的小伙子.
* It was one hell of a match, ie a very good and exciting match. 那场比赛精彩极了.
7 (idm 习语) be all one to sb => all3. be at `one (with sb/sth) be in agreement (with sb/sth) （与某人[某事物]）相同, 一致
*I'm at one with you/We are at one on this subject, ie Our opinions are the same. 在这个问题上我和你[我们]意见一致. get one over sb/sth (infml 口) gain an advantage over sb/sth 胜于或优于某人[某事物]
*They got one over us in the end by deciding to speak in German. 他们决定说德语, 终于略胜我们一筹. get sth in `one (infml 口) immediately be able to give an explanation, solve a problem, etc 马上能作出解释、解决问题等
*`We have to attract younger customers.' `Exactly, you've got it in one!' ｀我们得设法吸引年轻顾客.＇｀太对了, 你真是一语中的!＇ I, you, etc/sb for `one certainly I, you, etc/sb 我[你/某人]就是
*I for one have no doubt that he's lying. 起码我就深信不疑他撒谎.
* Lots of people would like to come -- your mother for one. 很多人都愿意来--你母亲就是其中之一. (,all) in `one combined 合在一起
*He's President, Treasurer and Secretary in one. 他身兼会长、司库和秘书三职.
* [attrib 作定语] the ,all-in-one first-`aid kit for everyday use 日用综合急救包. ,one after a`nother/the `other first one person or thing, and then another, and then another up to any number or amount 一个接一个; 相继; 陆续. ,one and `all (dated infml 旧, 口) everyone 人人; 每人; 大家
*A Happy New Year to one and all! 祝大家新年快乐! ,one and `only (used for emphasis 用以加强语气) only; sole 唯一的; 仅有的
*You have always been my one and only true love. 你一向是我唯一的真正的爱人.
* Here he is the one and only Frank Sinatra! 这就是他--独一无二的弗兰克·西纳特拉! ,one and the `same (used for emphasis 用以加强语气) the same 同一个; 完全一样; 完全一回事
*One and the same idea occurred to each of them. 他们都产生同样的想法. `one by `one individually in order 一个一个地; 逐一
*go through the items on a list one by one 逐个处理单子上的项目. ,one or `two a few 几个; 一两个
*One or two people can't come. 有一两个人不能来. one `up (on/over sb) having an advantage over sb; one step ahead of sb 略胜某人一筹; 领先某人一步
*Your experience as a sales assistant puts you one up on the other candidates. 你当过推销员, 这一经历就比其他申请人强. For the uses of one see the examples at five. 关于one的用法见five词条中的示例.
1 the number
1 *1; 一.
2 (idm 习语) number one => number.
1 (used as the object of a v or prep to avoid a and the repetition of a n 用作动词或介词的宾语以免重复a与名词)
*I forgot to bring a pen. Can you lend me one? 我忘带钢笔了. 你借我一枝行吗? (Cf 参看 I can't find the pen I was given. Have you seen it?)
* I haven't got any stamps. Could you give me one? 我没有邮票. 你能给我一枚吗?
* There have been a lot of accidents in the fog. I read about one this morning. 这大雾天已发生了很多事故. 今天上午我就看到其中一宗的报道.
2 ~ of (used with a pl n preceded by a det, eg the, my, your, these, etc to indicate a member of a class or group 与带有限定词如the、my、your、these等的复数名词连用, 指一类或一组中的一个)
*Mr Smith is not one of my customers. 史密斯先生不是我的主顾.
* She's knitting a jumper for one of her grandchildren. 她正在给一个孙儿织套头毛衣.
* He's staying with one of his friends. 他现住在一个朋友家里. (Cf 参看 a friend of his)
* We think of you as one (ie a member) of the family. 我们把你当成家里人.
n (never taking main stress 不重读)
1 (used after this, that, which or as a `prop-word' after an adj which cannot stand alone 用于this、that、which之後, 或用于不能独立使用的形容词之後作｀代词＇)
*I prefer `that one. 我喜欢那个.
* Which ones have you read? 你读过的是哪些?
* Your plan is a `good one. 你的计画很好.
* I need a `bigger one. 我需要一个大的.
* Those shoes are too small. We must buy some `new ones. 那些鞋太小了, 我们得买几双新的.
* The chance was too good a one to `miss. 那机会真好, 不容错过.
* Her new car goes faster than her `old one. 她的新汽车比旧的那辆跑得快.
2 (used with a group of words that identify the person(s) or thing(s) being considered 与修饰所指的人或事物的词组连用)
*Our hotel is the one nearest the beach. 我们的旅馆是离海滩最近的一家.
* The boy who threw the stone is the one with curly hair. 扔石头的那个男孩子是鬈发的.
* Students who do well in examinations are the ones who ask questions in class. 考试成绩好的都是上课爱提问的学生.
3 (idm 习语) a one (infml 口 esp Brit) (used to show amused surprise at sb's behaviour 用以表示对某人行为感到有趣得出奇)
*You asked your teacher how old she was? You are a one! 是你问老师她有多少岁的吗? 可真有你的!
* He is a one, your son. Never out of trouble! 你的儿子真是个活宝. 没有一会儿不惹麻烦的! the one about sb/sth the joke about sb/sth 关于某人[某事物]的笑话
*Do you know/Have you heard the one about the bald policeman? 你知道[听说过]那个秃头警察的笑话吗?
NOTE ON USAGE 用法
*In formal speech or writing the use of the nouns one/ones in senses
2 is avoided in the following cases 在正式的演说或文章中作1与2义的名词one/ones应避免用于下列情形
1 After a possessive (eg your, Mary's), unless it is followed by an adjective 在表示属有关系的词（如your、Mary' s）之後, 除非这类词後有形容词
*This is my car and that's my husband's. 这是我的汽车, 那辆是我丈夫的.
* (with adjective) My cheap camera takes better pictures than his expensive one. （与形容词连用）我的廉价照相机比他昂贵的照相机拍出的照片好.
2 When two adjectives indicate a contrast 在两个形容词表示对比时
*compare British and/with American universities (compare British universities with American ones is less formal) 试比较英国和美国的大学（compare British universities with American ones是较通俗的说法）.
3 After these and those 在these和those之後
*Do you prefer these designs or those (more formal than those ones)? 你喜欢这些图样还是那些图样（比those ones来得文些）? One/Ones may be used after which, even in formal speech, to distinguish singular from plural 即使在正式的演说中one/ones亦可用于which之後以区分单复数
*Here are the designs. Which one(s) do you prefer? ie You can choose one or several of them. 这就是那些图样. 你喜欢哪一个[些]? （即你可以从中选择一个或几个. ）
n (used, esp pl, after an adj, to refer to a person or people not previously specified 用于形容词之後, 尤其是复数ones, 指前文中未曾限定的人)
*It's time the ,little ones were in `bed. 小家伙们该睡觉了.
* pray to the ,Holy One (ie God) for for`giveness 祈求上帝宽恕.
pron (fml 文)
1 someone 某人
*He worked like one possessed, ie someone possessed by a spirit. 他干活儿像着了魔似的.
* She was never one to gossip, ie who would gossip. 她可不说人闲话.
* He's not one who is easily frightened. 他不是动不动就害怕的人.
* John is one who must certainly be invited. 约翰当然是必须邀请的.
2 (idm 习语) (be) one for (doing) sth (be) a person who is good at, spends a lot of time on or enjoys doing sth 善于、爱好或热衷于（做）某事物的人
*She's a great one for (solving) puzzles. 她是解谜能手.
pers pron (fml 文) (used as the subject or object of a v, or after a prep to refer to people generally, including the speaker or writer 用作动词的主语或宾语, 或用在介词之後泛指人们, 包括说话者或写作者在内)
*In these circumstances one prefers to be alone. 在这种情况下谁都愿意独处.
* A little delay will give one time to prepare. 只要稍稍推迟些就有时间作准备了.
* One must be sure of one's facts before making a public accusation. 要先掌握实据才可公开指责.
* (US) One does not like to have his word doubted. 谁都不愿意别人怀疑自己的话.