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。
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。
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？
a knife and fork
一副刀叉
A thousand people were there.
那里有一千人。
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。
She's a little Hitler.
她是个小希特勒。
There's a Mrs Green to see you.
有位格林太太要见你。
She died on a Tuesday.
她是在某个星期二去世的。
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
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〕
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
1.acceleration
2.activity
3.used to refer to the first vertical row of squares from the left on a chessboard
4.adenine
5.ampere
6.mass number
7.10
8.angstrom
9.used to indicate a main road other than a motorway
10.the first letter of the English alphabet, representing a vowel sound
11.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 A
14.a scale or key that starts on the note A
15.a graphic representation of the tone of A
16.the highest grade in a series, e.g. a top grade for academic work
17.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 position
20.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 excellent
22.a common <NDV>blood group</NDV> in the <NDV>abo system</NDV>
1.acceleration
2.activity
3.used to refer to the first vertical row of squares from the left on a chessboard
4.adenine
5.ampere
6.mass number
7.10
8.angstrom
9.used to indicate a main road other than a motorway
10.the first letter of the English alphabet, representing a vowel sound
11.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 A
14.a scale or key that starts on the note A
15.a graphic representation of the tone of A
16.the highest grade in a series, e.g. a top grade for academic work
17.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 position
20.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 excellent
22.a common <NDV>blood group</NDV> in the <NDV>abo system</NDV>
1.used before a noun to indicate that somebody or something has some of the same qualities as the person or thing mentioned
2.used instead of "one" with words of measurement
3.in each or in every
4.used to indicate somebody not personally known, but known of
5.used in negative structures to emphasize a complete absence of something
1.used before a noun to indicate that somebody or something has some of the same qualities as the person or thing mentioned
2.used instead of "one" with words of measurement
3.in each or in every
4.used to indicate somebody not personally known, but known of
5.used in negative structures to emphasize a complete absence of something
1.used before a noun to indicate that somebody or something has some of the same qualities as the person or thing mentioned
2.used instead of 'one' with words of measurement
3.in each or in every
4.used to indicate somebody not personally known, but known of
5.used in negative structures to emphasize a complete absence of something
6.used 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 them
7.used when you mean any person or thing of a particular type, but you are not referring to a specific one
8.used when you say what class, type, or group someone or something belongs to, or what job someone has
9.used before a singular noun that represents every person or thing of a particular type
10.used when you are referring to a person or thing as one of several people or things of this type
11.used in expressions of quantity such as “a lot,” “a few,” or “a great deal”
12.used in numbers and measurements to mean “one,” as in “a thousand” or “an hour”
13.used in phrases showing how much something costs, how often it happens, how fast it goes, etc.
14.used before a noun that means a substance, product, food, etc. when referring to a particular type of it
15.used before the name of some drinks to mean a cup or glass of that drink
16.used before a noun that means a particular quality or feeling when the quality or feeling is described in some way
17.used before a noun that is formed from a verb and means a single action of that verb
18.used before a noun that expresses your feelings about a situation
19.used before the name of a particular day, season, or holiday to mean one particular Tuesday, summer, Christmas, etc.
20.used before a person’s name when you do not know anything about them
21.about
22.academy
23.acre
24.adult
25.answer
26.arrives
27.amp
1.used before a noun to indicate that somebody or something has some of the same qualities as the person or thing mentioned
2.used instead of 'one' with words of measurement
3.in each or in every
4.used to indicate somebody not personally known, but known of
5.used in negative structures to emphasize a complete absence of something
6.used 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 them
7.used when you mean any person or thing of a particular type, but you are not referring to a specific one
8.used when you say what class, type, or group someone or something belongs to, or what job someone has
9.used before a singular noun that represents every person or thing of a particular type
10.used when you are referring to a person or thing as one of several people or things of this type
11.used in expressions of quantity such as “a lot,” “a few,” or “a great deal”
12.used in numbers and measurements to mean “one,” as in “a thousand” or “an hour”
13.used in phrases showing how much something costs, how often it happens, how fast it goes, etc.
14.used before a noun that means a substance, product, food, etc. when referring to a particular type of it
15.used before the name of some drinks to mean a cup or glass of that drink
16.used before a noun that means a particular quality or feeling when the quality or feeling is described in some way
17.used before a noun that is formed from a verb and means a single action of that verb
18.used before a noun that expresses your feelings about a situation
19.used before the name of a particular day, season, or holiday to mean one particular Tuesday, summer, Christmas, etc.
20.used before a person’s name when you do not know anything about them
21.about
22.academy
23.acre
24.adult
25.answer
26.arrives
27.amp