A's

1.〈美〉(学业成绩的)优等

2.【乐】A音;A调

3.英文字母表的第一字母

4.A 字形(物)

5.【数】第一已知数

6.表示“第一”的符号

1.一(副)

2.每(...),在...内,按(...而论),换(得)

3.同一的,相同的

4.任何一个[种]

5.〈口〉一客

6.indefinite art

7.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

8.一

9.与数量形容词,数词等连用而表示一个整体单位

10.与某些复数名词连用而仍表示一个单位

11.与序数词或形容词最高级结合共同限定所修饰的名词

12.抽象名词用作普通名词,表示类别,例证

13.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

14.与 how, what, such, too, so, quite, rather 以及 half 等搭配使用时,常置于各该词的后面

1.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

2.used when you mean any person or thing of a particular type, but you are not referring to a specific one

3.used when you say what class, type, or group someone or something belongs to, or what job someone has

4.used before a singular noun that represents every person or thing of a particular type

5.used when you are referring to a person or thing as one of several people or things of this type

6.used in expressions of quantity such as “a lot,” “a few,” or “a great deal”

7.used in numbers and measurements to mean “one,” as in “a thousand” or “an hour”

8.used in phrases showing how much something costs, how often it happens, how fast it goes, etc.

9.used before a noun that means a substance, product, food, etc. when referring to a particular type of it

10.used before the name of some drinks to mean a cup or glass of that drink

11.used before a noun that means a particular quality or feeling when the quality or feeling is described in some way

12.used before a noun that is formed from a verb and means a single action of that verb

13.used before a noun that expresses your feelings about a situation

14.used before the name of a particular day, season, or holiday to mean one particular Tuesday, summer, Christmas, etc.

15.used before a person’s name when you do not know anything about them; used before the name of a famous artist to mean a picture by that artist; used before a family name to mean a member of that family; used before the name of a famous person to mean someone else with similar abilities, a similar appearance, or a similar personality

1.the first letter of the English alphabet. A is a vowel.

2.the sixth note in the musical scale of C major

3.a mark that a teacher gives to a student’s work to show that it is excellent

4.a common blood type in the abo system