a
美式发音: [ə] 英式发音: [eɪ]na.一
复数：a’s 复数：A's 复数：As a显示所有例句art.1.（用于可数名词或单数名词前，表示未曾提到的）一（人、事、物）used before countable or singular nouns referring to people or things that have not already been mentioned
an aunt/egg/hour/x-ray一位姑母；一颗鸡蛋；一小时；一张 X 光片
I can only carry two at a time.我一次只能带两个。
There's a visitor for you.有位客人找你。
She's a friend of my father's(= one of my father's friends) .她是我父亲的朋友。
2.（用于前有形容词或后有短语的不可数名词前）used before uncountable nouns when these have an adjective in front of them, or phrase following them
a good knowledge of French精通法语
a sadness that won't go away挥之不去的悲愁
A lion is a dangerous animal.狮子是猛兽。
4.（表示为某一群体或职业中的一员）used to show that sb/sth is a member of a group or profession
Their new car's a BMW.他们的新轿车是辆宝马。
Is that a Monet(= a painting by Monet) ?那是莫奈的画吗？
5.（用于视为一体的两个名词之前）used in front of two nouns that are seen as a single unit
6.（用于某些数字前，代替 one）used instead ofone before some numbers
A thousand people were there.那里有一千人。
7.（用于价格、数量、比率等）一，每一used when talking about prices, quantities and rates
They cost 50p a kilo.其价钱是一公斤 50 便士。
I can type 50 words a minute.我每分钟能打 50 个单词。
He was driving at 50 miles an hour.当时他正以每小时 50 英里的速度驾车。
8.像（某人）的人；…式的人物a person like sb
She's a little Hitler.她是个小希特勒。
9.（用于某人姓名前，表示说话者不认识此人）有个used before sb's name to show that the speaker does not know the person
There's a Mrs Green to see you.有位格林太太要见你。
10.（用于一星期中某天的名称前，表示具体某一天）used before the names of days of the week to talk about one particular day
She died on a Tuesday.她是在某个星期二去世的。
n.1.英文字母表的第一字母2.【数学】第一已知数3.(学业成绩的)优等4.表示“第一”的符号5.腺苷6.吸光率1.英文字母表的第一字母2.【数学】第一已知数3.(学业成绩的)优等4.表示“第一”的符号5.腺苷6.吸光率
art.1.〔普通可数名词第一次提到时,冠以不定冠词主要表示类别,有时则兼含“一”的概念〕
na.1.〔在数量概念上,说明表示时间,距离,重量及数目的名词〕一2.〔与数量形容词,数词等连用而表示一个整体单位〕3.〔与某些复数名词连用而仍表示一个单位〕4.〔与序数词或形容词最高级结合共同限定所修饰的名词〕5.〔表示同类事物中的代表〕任何一个[种]6.同一的,相同的7.一(副)8.〔抽象名词用作普通名词,表示类别,例证〕9.〔用于专有名词前,以整体概括个体,表示类似的一个或某一个〕10.每(...),在...内,按(...而论),换(得)11.〔口语〕一客1.〔在数量概念上,说明表示时间,距离,重量及数目的名词〕一2.〔与数量形容词,数词等连用而表示一个整体单位〕3.〔与某些复数名词连用而仍表示一个单位〕4.〔与序数词或形容词最高级结合共同限定所修饰的名词〕5.〔表示同类事物中的代表〕任何一个[种]6.同一的,相同的7.一(副)8.〔抽象名词用作普通名词,表示类别,例证〕9.〔用于专有名词前,以整体概括个体,表示类似的一个或某一个〕10.每(...),在...内,按(...而论),换(得)11.〔口语〕一客
n.1.acceleration2.activity3网站屏蔽ed to refer to the first vertical row of squares from the left on a chessboard4.adenine5.ampere6.mass number7.108.angstrom9网站屏蔽ed to indicate a main road other than a motorway10.the first letter of the English alphabet, representing a vowel sound11.a written representation of the letter "a"12.the sixth note of a scale in C major. The A above middle C is often used to tune instruments and is standardized at a frequency of 440 hertz.13.a string, key, or pipe tuned to produce the note A14.a scale or key that starts on the note A15.a graphic representation of the tone of A16.the highest grade in a series, e.g. a top grade for academic work17.a human blood type of the ABO system, containing the A antigen.18.something shaped like a letter 'A'19.in the market research system that classifies people according to their occupation, somebody in a senior management, professional, or administrative position20.the sixth note in the musical <NDV>scale</NDV> of C <NDV>major</NDV>21.a mark that a teacher gives to a student’s work to show that it is excellent22.a common <NDV>blood group</NDV> in the <NDV>abo system</NDV>1.acceleration2.activity3网站屏蔽ed to refer to the first vertical row of squares from the left on a chessboard4.adenine5.ampere6.mass number7.108.angstrom9网站屏蔽ed to indicate a main road other than a motorway10.the first letter of the English alphabet, representing a vowel sound11.a written representation of the letter "a"12.the sixth note of a scale in C major. The A above middle C is often used to tune instruments and is standardized at a frequency of 440 hertz.13.a string, key, or pipe tuned to produce the note A14.a scale or key that starts on the note A15.a graphic representation of the tone of A16.the highest grade in a series, e.g. a top grade for academic work17.a human blood type of the ABO system, containing the A antigen.18.something shaped like a letter 'A'19.in the market research system that classifies people according to their occupation, somebody in a senior management, professional, or administrative position20.the sixth note in the musical <NDV>scale</NDV> of C <NDV>major</NDV>21.a mark that a teacher gives to a student’s work to show that it is excellent22.a common <NDV>blood group</NDV> in the <NDV>abo system</NDV>
art.1网站屏蔽ed before a noun to indicate that somebody or something has some of the same qualities as the person or thing mentioned2网站屏蔽ed instead of "one" with words of measurement3.in each or in every4网站屏蔽ed to indicate somebody not personally known, but known of5网站屏蔽ed in negative structures to emphasize a complete absence of something1网站屏蔽ed before a noun to indicate that somebody or something has some of the same qualities as the person or thing mentioned2网站屏蔽ed instead of "one" with words of measurement3.in each or in every4网站屏蔽ed to indicate somebody not personally known, but known of5网站屏蔽ed in negative structures to emphasize a complete absence of something
na.1网站屏蔽ed before a noun to indicate that somebody or something has some of the same qualities as the person or thing mentioned2网站屏蔽ed instead of 'one' with words of measurement3.in each or in every4网站屏蔽ed to indicate somebody not personally known, but known of5网站屏蔽ed in negative structures to emphasize a complete absence of something6网站屏蔽ed when you are mentioning a person or a thing for the first time, or when the person listening to you does not already know about them7网站屏蔽ed when you mean any person or thing of a particular type, but you are not referring to a specific one8网站屏蔽ed when you say what class, type, or group someone or something belongs to, or what job someone has9网站屏蔽ed before a singular noun that represents every person or thing of a particular type10网站屏蔽ed when you are referring to a person or thing as one of several people or things of this type11网站屏蔽ed in expressions of quantity such as “a lot,” “a few,” or “a great deal”12网站屏蔽ed in numbers and measurements to mean “one,” as in “a thousand” or “an hour”13网站屏蔽ed in phrases showing how much something costs, how often it happens, how fast it goes, etc.14网站屏蔽ed before a noun that means a substance, product, food, etc. when referring to a particular type of it15网站屏蔽ed before the name of some drinks to mean a cup or glass of that drink16网站屏蔽ed before a noun that means a particular quality or feeling when the quality or feeling is described in some way17网站屏蔽ed before a noun that is formed from a verb and means a single action of that verb18网站屏蔽ed before a noun that expresses your feelings about a situation19网站屏蔽ed before the name of a particular day, season, or holiday to mean one particular Tuesday, summer, Christmas, etc.20网站屏蔽ed before a person’s name when you do not know anything about them21.about22.academy23.acre24.adult25.answer26.arrives27.amp1网站屏蔽ed before a noun to indicate that somebody or something has some of the same qualities as the person or thing mentioned2网站屏蔽ed instead of 'one' with words of measurement3.in each or in every4网站屏蔽ed to indicate somebody not personally known, but known of5网站屏蔽ed in negative structures to emphasize a complete absence of something6网站屏蔽ed when you are mentioning a person or a thing for the first time, or when the person listening to you does not already know about them7网站屏蔽ed when you mean any person or thing of a particular type, but you are not referring to a specific one8网站屏蔽ed when you say what class, type, or group someone or something belongs to, or what job someone has9网站屏蔽ed before a singular noun that represents every person or thing of a particular type10网站屏蔽ed when you are referring to a person or thing as one of several people or things of this type11网站屏蔽ed in expressions of quantity such as “a lot,” “a few,” or “a great deal”12网站屏蔽ed in numbers and measurements to mean “one,” as in “a thousand” or “an hour”13网站屏蔽ed in phrases showing how much something costs, how often it happens, how fast it goes, etc.14网站屏蔽ed before a noun that means a substance, product, food, etc. when referring to a particular type of it15网站屏蔽ed before the name of some drinks to mean a cup or glass of that drink16网站屏蔽ed before a noun that means a particular quality or feeling when the quality or feeling is described in some way17网站屏蔽ed before a noun that is formed from a verb and means a single action of that verb18网站屏蔽ed before a noun that expresses your feelings about a situation19网站屏蔽ed before the name of a particular day, season, or holiday to mean one particular Tuesday, summer, Christmas, etc.20网站屏蔽ed before a person’s name when you do not know anything about them21.about22.academy23.acre24.adult25.answer26.arrives27.amp
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造句带翻译释义:,一,英文字母表的第一字母,冠以不定冠词主要表示类别,从,按,一个1.oh never metion it, a factory beside my house made noise all around yesterday, i'd gotta be deaf without an earplug.别提了。昨天我家旁边的工厂不断发出噪音一整天，如果没有耳塞我可能就聋了。
2.looks dry to me, but you may be able to squeeze out a few drops.那个柠檬看来已经干了，但也许你还能挤出几滴汁来。
3.The shortish and baldish former gold salesman is about as far from the popular image of a Wall Street titan as you can get.这位前“黄金推销员”个头不高，有些谢顶，远非你所想象的那种受欢迎的华尔街巨头。
4.Paltrow portrays an opportunistic thief with a willingness to lift the jewelry from the dead and a cold-hearted view of men.帕特洛描绘与愿意取消从死者和一冷心肠的人认为是机会主义的珠宝窃贼。
5.Through chattering teeth, she told her that she was cold, that she wanted a sheet for her gurney.她问，能不能给她个床单。她太冷了，牙齿都冷的一直在打架。
6.In recent years, Henry Hu, a finance professor at Texas University, has often been a thorn in the side of the banking world.近些年，得克萨斯大学（TexasUniversity）金融学教授亨利•胡（HenryHu）屡屡被银行界视作眼中钉。
7.I suppose if I were East Indian, then I would be proud of it, but as such, I only pointed it out as a known fact.如果我要是东印度人，那么我确实会骄傲，但我只是将那些当做众人皆知的事实说了出来。
8.The researcher as teacher differs from the previous analogies, and that very distinction is often thought to make him or her a good teacher.把教师比作研究者与刚才的比拟不同，有个很大的差别就试，常常以为研究工作能使他或她成为好老师。
9.You really love the Man, with a total not to tell you thinking, because in fact his plan for you with the most beautiful real future.真正爱你的男人，总告诉你不要胡思乱想，因为其实他在为你们谋划着最美丽真实的未来。
10.It was like they were taken into a bomb alley and attacked. They complained of brutality and shameful treatment.就好象他们被带入了一条充满炸药的小路然后被攻击了。他们抱怨遭受到的野蛮而无耻的袭击。