from A to Z
a
determiner
ukweak /ə/ukstrong /eɪ/usweak /ə/usstrong /eɪ/(alsoan)

adeterminer (NOT PARTICULAR)

A1
used before a noun to refer to a single thing or person that has not been mentioned before, especially when you are not referring to a particular thing or person: 一（个）（用于名词前，表示未曾提及的，尤其是非特指的人、事、物）
I've bought a car.我买了辆汽车。
She's got a boyfriend.她交了个男朋友。
There was a sudden loud noise.突然发出一声巨响。
What a shame that you couldn't go to the party.你不能去参加聚会，太遗憾了。
I heard a child crying.我听见有个孩子在哭。
Is he a friend of yours (= one of your friends)?他是你的朋友吗？
A1
used to say what type of thing or person something or someone is: （表示人或物的类型）
She wants to be a doctor when she grows up.她长大了想当医生。
This is a very mild cheese.这是一种很清淡的奶酪。
Experts think the painting may be a Picasso (= one done by Picasso).专家们认为这幅画可能出自毕加索的手笔。
A1
used to mean any or every thing or person of the type you are referring to: （泛指所指类别中的任何一个）
Can you ride a bike?你会骑自行车吗？
A cheetah can run faster than a lion.猎豹能跑过狮子。
A teacher needs to have a lot of patience.做老师需要很有耐心。
used before some uncountable nouns when you want to limit their meaning in some way, such as when describing them more completely or referring to one example of them: （用于一些不可数名词前，在某种意义上起限定性作用）
I only have a limited knowledge of Spanish.我只懂一点西班牙语。
He has a great love of music.他酷爱音乐。
There was a fierceness in her voice.她的声音中透着股凶气。
A2
used before some nouns of action when referring to one example of the action: （用于某些行为名词前）一下；一次
Take a look at this, Jez.杰兹，看一下这个。
I'm just going to have a snack.我正要去洗个澡。
There was a knocking at the door.有人敲门。
A2
used when referring to a unit or container of something, especially something you eat or drink: （尤指饮食的）一份
I'd love a coffee.我想来杯咖啡。
All I had for lunch was a yogurt.午饭我只喝了一杯酸奶。
A2
used before the first but not the second of two nouns that are referred to as one unit: （用于被视为一体的两个名词中的第一个词前）一副；一套；一组
a cup and saucer一副杯碟
a knife and fork一副刀叉
A2
used before some words that express a number or amount: （用于某些表示数量的词前）
a few days几天
a bit of wool一点羊毛
a lot of money很多钱
used in front of a person's name when referring to someone who you do not know: （用于不认识的人名前）有个，某一（个）
There's a Ms Evans to see you.有位埃文斯女士找你。
used in front of someone's family name when they are a member of that family: （用于某人的姓之前，表示其为该姓家族成员）
Is that a Wilson over there?那边那个人是威尔逊家的吗？
used before the name of a day or month to refer to one example of it: （用于日期、月份前）一个
My birthday is on a Friday this year.今年我的生日是个星期五。
It's been a very wet June.今年6月一直都特别潮湿。
What is the usual pay for a job like this one?
Suddenly a dog ran out into the road in front of us.
The customer said she'd like this coat if it was a nicer colour.
Colin told a joke about a postman, but it wasn't very funny.
Shall I bring a bottle of wine with me?

adeterminer (ONE)

A1
one: 一（个）
a hundred一百
a thousand一千
a dozen一打
There were three men and a woman.有三位男士和一位女士。
A2
used between a fraction and a unit of measurement: （用于分数和度量单位之间）
half a mile半英里
a quarter of a kilo1/4公斤
three quarters of an hour三刻钟
six tenths of a second0.6秒
A2
used when saying how often something happens in a certain period: （指某事在特定时间段内发生的频率）每一（个），一
Take one tablet three times a day.一日三次，每次一片。
I swim once a week.我每星期游一次泳。
A2
used when saying how much someone earns or how much something costs in a certain period: （指特定时间段内的收入或费用）一，每
She earns $100,000 a year.她一年挣10万美元。
My plumber charges £30 an hour.管子工每小时收我30英镑的维修费。
I pay £25 a week for my parking permit.我的停车证费用是每周25英镑。

SMART Vocabulary: related words and phrases

Numbers: cardinal, including nought & zero
B, b
bi
cipher
deca-
duodecillion
fifteen
forty
googol
jillion
kazillion
naught
nineteen
six
sixty
ten
thirteen
thirty
unit
zero
zillion

You can also find related words, phrases, and synonyms in the topics:

Fractions
Linguistics: both, all, each & every

Grammar