a

US [ə]
UK [eɪ]
Plural Form：a’s  Plural Form：A's  Plural Form：As  

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Web Definition

a
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
a man/horse/unit
一个人；一匹马；一个单位
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
3.
任何一；每一any; every
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。
She's a Buddhist.
她是佛教徒。
He's a teacher.
他是教师。
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
a knife and fork
一副刀叉
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。

Sample Sentence

Definition:
AllAll,一一,英文字母表的第一字母英文字母表的第一字母,冠以不定冠词主要表示类别冠以不定冠词主要表示类别,从从,按按,一个一个
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard
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。
bié tí le 。 zuó tiān wǒ jiā páng biān de gōng chǎng bú duàn fā chū zào yīn yī zhěng tiān , rú guǒ méi yǒu ěr sāi wǒ kě néng jiù lóng le 。
goabroad.zhishi.sohu.com
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。
nà ge níng méng kàn lái yǐ jīng gàn le , dàn yě xǔ nǐ hái néng jǐ chū jǐ dī zhī lái 。
dict.ebigear.com
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。
zhè wèi qián " huáng jīn tuī xiāo yuán " gè tóu bù gāo , yǒu xiē xiè dǐng , yuǎn fēi nǐ suǒ xiǎng xiàng de nà zhǒng shòu huān yíng de huá ěr jiē jù tóu 。
www.ftchinese.com
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。
pà tè luò miáo huì yǔ yuàn yì qǔ xiāo cóng sǐ zhě hé yī lěng xīn cháng de rén rèn wéi shì jī huì zhǔ yì de zhū bǎo qiè zéi 。
word.hcbus.com
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。
tā wèn , néng bu néng gěi tā gè chuáng dān 。 tā tài lěng le , yá chǐ dōu lěng de yì zhí zài dǎ jià 。
article.yeeyan.org
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。
jìn xiē nián , dé kè sà sī dà xué ( TexasUniversity ) jīn róng xué jiào shòu hēng lì • hú ( HenryHu ) lǚ lǚ bèi yín háng jiè shì zuò yǎn zhōng dīng 。
www.ftchinese.com
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。
rú guǒ wǒ yào shi dōng yìn dù rén , nà me wǒ què shí huì jiāo ào , dàn wǒ zhǐ shì jiāng nà xiē dàng zuò zhòng rén jiē zhī de shì shí shuō le chū lái 。
www.acfun.tv
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。
bǎ jiào shī bǐ zuò yán jiū zhě yǔ gāng cái de bǐ nǐ bù tóng , yǒu gè hěn dà de chā bié jiù shì , cháng cháng yǐ wéi yán jiū gōng zuò néng shǐ tā huò tā chéng wéi hǎo lǎo shī 。
dictsearch.appspot.com
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。
zhēn zhèng ài nǐ de nán rén , zǒng gào su nǐ bú yào hú sī luàn xiǎng , yīn wèi qí shí tā zài wèi nǐ men móu huà zhe zuì měi lì zhēn shí de wèi lái 。
www.chinavalue.net
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。
jiù hǎo xiàng tā men bèi dài rù le yī tiáo chōng mǎn zhà yào de xiǎo lù rán hòu bèi gōng jī le 。 tā men bào yuàn zāo shòu dào de yě mán ér wú chǐ de xí jī 。
www.tgfcer.com