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Merriam-Webster's Advanced Learner's Dictionary

導出

a

833 ENTRIES FOUND:

¹ a noun

or A /ˈeɪ/

plural a's or as or A's or As

¹ a

noun

or A /ˈeɪ/

plural a's or as or A's or As

Learner's definition of A

: the first letter of the English alphabet英语字母表的第1个字母

[count]

a word that begins with an a以字母a开头的单词

[noncount]

a word that begins with a以字母a开头的单词

: a musical note or key referred to by the letter A : the sixth tone of a C-major scale*A音（C大调音阶的第6音或音符）；A调

[count]

play/sing an A演奏/演唱A调

[noncount]

a song in the key of A*A调歌曲

[count] : a grade that is given to a student for doing excellent work（学业成绩）第一等，优秀

She got an A on the exam.她考试得了个A。
He's an A student. [=a student who gets A's for his schoolwork]他是一个头等生。

[noncount] — used to refer to the first of two or more people, places, or things that are being considered（正在考虑的人、地点或事物中的）第一个，甲

If A, B, and C divide the coins equally, how many does each person get?如果甲、乙、丙三人均分这些硬币，每人获得几枚？

an A for effort

— see effort

exhibit A

— see ²exhibit

from A to Z

: including everything从头到尾；全部

The book is titled “Home Repairs From A to Z.”这本书名为《家庭修理大全》。

from (point) A to (point) B

: from one place to another从一地到另一地

I don't care about the scenery. I'm only interested in getting from A to B.我不在乎风景。我就喜欢东游西逛。

² a /ə/ /ˈeɪ/ indefinite article

or an /ən/ /ˈæn/

² a

/ə/ /ˈeɪ/

indefinite article

or an /ən/ /ˈæn/

Learner's definition of A

◊ A is used before a consonant sound.*a用于辅音之前。

a door一扇门
a human一个人

An is used before a vowel sound.*an用于元音之前。

an icicle一条冰柱
an honor一项荣誉

Note that when a word begins with a vowel letter but is pronounced with a consonant sound, a is used.注意：当单词首字母是元音字母但其发音为辅音时，用a。

a one一个单词
a union一个联盟

When an abbreviation begins with a consonant letter but is pronounced with a vowel sound, an is used.当缩略词首字母是辅音字母但其发音为元音时，用an。

an FBI investigation联邦调查局的一项调查
an LCD display一台液晶显示器

When a word begins with h but the first syllable of the word is not given primary stress, both a and an are used.当单词以h开头，但该单词的首音节非重读时，a和an都可用。

a historic一个历史性的
an historic一个历史性的

— used before singular nouns when the person or thing is being mentioned for the first time用于首次被提及的单数名词前

There was a tree in the field.田野里有一棵树。
A man walked past him.一个人从他身边走过。
I heard a shout.我听到一声喊叫。
He bought a house, but this is not the house he bought.他买了一栋房子，但是这栋房子并不是他买的那一栋。
I ordered an apple and some cheese: I ate the apple but not the cheese.我点了一个苹果和一些奶酪：我把苹果吃了，但没吃奶酪。

a — used like one before number words like hundred, thousand, etc.用于hundred、thousand等数词前，用法同one

a hundred and twenty people一百二十人
a million dollars一百万美元
a dozen doughnuts一打炸面圈

b — used like one before number words like third, fortieth, etc.用于third、fortieth等序数词前，用法同one

This is a [=one] third the size of that.这个的尺寸只有那个的三分之一。

c — used like one before units of weight, measurement, etc.用于计量单位前，用法同one

a pound or two [=one or two pounds]一磅或两磅
a week or two [=one or two weeks]一周或两周
a foot and a half of water = one and a half feet of water*1.5英尺深的水

d : one single : even one — used in negative constructions一个，单个（用于否定结构）

They didn't charge me a penny. [=they didn't charge me anything at all]他们没有收我一分钱。
“Did she say anything about it?” “Not a word.”“她对此事说什么了吗？”“一个字都没说。”

— used before a word or phrase that indicates a type or class of person or thing用于表示一类人或一类事物的单词或短语前

My uncle is a plumber.我叔叔是个水管工。
Copper is a metal.铜是一种金属。
She's a very nice lady.她是一位很和善的女士。

— often used before noncount nouns that are modified by an adjective or phrase常用于由形容词或短语修饰的不可数名词前

a torrential rain一阵急雨
She has a warmth that puts people at ease.她待人热情，让人感到亲切。
I've always had a fondness for chocolate.我一直很爱吃巧克力。

— used like any to refer in a general way to people or things用于泛指人或事物，用法同any

A person who is sick can't work well. [=people can't work well if they are sick]生病的人工作效率不高。

— used before a proper noun to indicate limited knowledge about the person or thing being mentioned用于专有名词前，表示对提及的人或事物所知有限

A Mr. Smith [=a man named Mr. Smith] called to ask about the job.一位史密斯先生打电话询问工作的事。
Among the towns of the area there is a Newton, I believe.据我了解，这个地区有一个牛顿镇。

a — used before a proper noun that is acting as an example or type用于充当例证或典型的专有名词前

the attractions of a Boston or a Cleveland波士顿或克利夫兰这类城市的景点
His friends say he's an Einstein in regard to science.他的朋友们说，在科学方面他是爱因斯坦式的人物。

b — used before the name of a day of the week to refer to one occurrence of it用于一星期中某天的名称前，以提及当天发生的某件事情

My birthday falls on a Tuesday this year.今年我的生日是一个星期二。

a — used before the name of a person (such as a famous artist) when the name is being used to refer to something (such as a painting) created by that person用于人名前，指此人的作品

The museum recently purchased a Rembrandt. [=a painting by Rembrandt]博物馆最近购入了一幅伦勃朗的画作。
My violin is a Stradivarius.我的小提琴出自大师斯特拉迪瓦里之手。

b — used before a family name to show that someone is a member of that family用于姓氏前，表示某人为此家庭的一员

Did you know that she's a Kennedy?你知道她是肯尼迪家族的一员吗？

— used before a proper noun referring to a person or thing that has a particular quality用于专有名词前，表示某人或某物具有某种特殊品质

A triumphant Ms. Jones greeted her supporters. [=Ms. Jones was triumphant when she greeted her supporters]志得意满的琼斯女士向支持者们致意。
We were met at the door by an embarrassed Mr. Brown. [=Mr. Brown was embarrassed when he met us at the door]布朗先生在门口见到我们时神色尴尬。
We had a very mild January.一月的天气非常温和。

— used with words like bit and little to form phrases that describe quantity, amount, or degree与bit、little等单词连用构成短语，表数量、程度等

She felt a bit tired.她感到有点疲惫。
It's getting a little late.天有点晚了。

— used in phrases that describe how often something occurs, how fast something is going, etc.用于表示频率、快慢等的短语

They meet twice a week. [=twice each week]他们一周见两次面。
The car was traveling at a hundred miles an [=per] hour.汽车当时正以一百英里的时速行驶。

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檢索以下詞典：(Mr. Ng 不推薦使用 Google 翻譯！)