A
noun
indefinite article, determiner
eɪ
noun
1
the
first
letter
of
the
English
alphabet
英语字母表的第一个字母
C,U
2
the
sixth
note
in
the
musical
SCALE
of
C
MAJOR
or
the
musical
KEY
based
on
this
note
A音〔C 大调音阶中的第六个音〕; A 调
C,U
3
the
highest
mark
that
a
student
can
get
in
an
examination
or
for
a
piece
of
work
A
级，甲级，甲等〔表示学业成绩优秀〕
C
I
got
an
A
in
French.
法语我得了个 A。
Julia
got
straight
As
(=all
As)
in
high
school.
朱丽娅读中学时成绩全部是 A。
4
an A student
someone
who
regularly
gets
the
best
marks
possible
for
their
work
in
school
or
college
[美] 优等生
AmE
5
used
to
refer
in
a
short
way
to
one
of
two
different
things
or
people.
You
can
call
the
second
one
B.
甲，A〔两个不同事物或不同人中的一个，另一个称乙（B）〕
U
A
demands
£500,
B
offers
£100.
甲方索要 500 英镑，乙方愿出 100 英镑。
6
from A to B
from
one
place
to
another
从一地到另一地
get/go
from
A
to
B
Hiring
a
car
was
the
best
way
to
get
from
A
to
B.
租车是从一地到另一地的最好方法。
7
from A to Z
describing,
including,
or
knowing
everything
about
a
subject
从头到尾〔表示描述、涵盖或了解一个科目的全部内容〕
the
history
of
art
from
A
to
Z
艺术通史
8
A34, A40 etc
the
name
of
a
road
in
Britain
that
is
smaller
than
a
MOTORWAY
,
but
larger
than
a
B-ROAD
A34（主干）公路，A40（主干）公路等〔英国公路名称，介于高速公路和 B 级公路之间〕
9
a
common
type
of
blood
A型〔一种常见血型〕
U
10
amp
the
written
abbreviation
of
书面缩写= ampor amps
ə
indefinite article, determiner
11
used
to
show
that
you
are
talking
about
someone
or
something
that
has
not
been
mentioned
before,
or
that
your
listener
does
not
know
about
一，一个〔用于未曾提及或对方不知道的人或物的名称前〕
We
have
a
problem.
我们遇到了一个麻烦。
There
was
a
hole
in
the
fence.
篱笆上有一个洞。
Suddenly
they
heard
a
loud
bang.
他们突然听到砰的一声。
12
used
to
show
that
you
are
referring
to
a
general
type
of
person
or
thing
and
not
a
specific
person
or
thing
〔用于泛指一类人或一类事物〕
Would
you
like
a
sandwich?
来块三明治好吗？
I
want
to
train
to
be
an
engineer.
我想受训做工程师。
He’s
a
really
nice
man.
他真是个好人。
Take
a
look
at
this.
瞧瞧这个。
It
needs
a
good
clean.
这得好好清洗一下。
13
used
before
someone’s
family
name
to
show
that
they
belong
to
that
family
〔用于某人的姓氏前表明其属于这个家庭〕
One
of
his
daughters
had
married
a
Rothschild.
他有个女儿嫁给了罗思柴尔德家的人。
14
one
一（个）
a
thousand
pounds
一千英镑
a
dozen
eggs
一打鸡蛋
You’ll
have
to
wait
an
hour
or
two.
你得等一两个小时。
15
used
in
some
phrases
that
say
how
much
of
something
there
is
〔用于某些表示数量的短语〕
There
were
a
lot
of
people
at
the
party.
许多人参加了聚会。
A
few
weeks
from
now
I’ll
be
in
Venice.
再过几个礼拜我就在威尼斯了。
You
have
caused
a
great
deal
of
trouble.
你惹出了很多麻烦。
16
used
to
mean
‘each’
when
stating
prices,
rates,
or
speeds
每一（个）〔用于表明价格、比率或速度〕
I
get
paid
once
a
month.
我的工资一个月发一次。
The
eggs
cost
$2
a
dozen.
鸡蛋两美元一打。
17
used
before
singular
nouns
to
mean
all
things
of
a
particular
type
任一，每一〔用于单数名词前表示某一类的全部〕
A
square
has
four
sides
(=all
squares
have
four
sides)
.
正方形有四条边。
A
child
needs
love
and
affection.
孩子需要爱和关怀。
18
used
once
before
two
nouns
that
are
mentioned
together
very
often
〔用于两个经常连用的名词前〕
I’ll
fetch
you
a
cup
and
saucer.
我去给你拿一副杯碟来。
Does
everyone
have
a
knife
and
fork?
每个人都有刀叉了吗？
19
used
before
the
-ing
forms
of
verbs
when
they
are
used
as
nouns
referring
to
an
action,
event,
or
sound
〔用于表示动作、事件或声音的动词的 -ing 形式之前〕
There
was
a
beating
of
wings
overhead.
头顶上传来翅膀的拍打声。
Bernice
became
aware
of
a
humming
that
seemed
to
come
from
all
around
her.
伯尼斯发现周围好像有嗡嗡嗡的声音。
20
used
before
nouns
that
are
usually
UNCOUNTABLE
when
other
information
about
the
quality,
feeling
etc
is
added
by
an
adjective,
phrase,
or
CLAUSE
〔用于有形容词、短语或从句修饰的不可数名词前〕
Candidates
must
have
a
good
knowledge
of
chemistry.
求职者必须精通化学。
21
used
before
the
name
of
a
substance,
food
etc
to
refer
to
a
particular
type
of
it
〔用于物质、食品等名称前表示一类〕
Use
a
good
cheese
to
make
the
sauce.
要用优质的奶酪来做调味酱。
plants
that
grow
well
in
a
moist
soil
在湿润的土壤中生长良好的植物
22
used
before
the
name
of
a
drink
to
refer
to
a
cup
or
glass
of
that
drink
一杯〔用于饮料名称前〕
Can
I
get
you
a
coffee?
我给你倒杯咖啡好吗？
Renwick
went
to
the
bar
and
ordered
a
beer.
伦威克走到吧台前点了杯啤酒。
23
used
before
the
name
of
a
famous
artist
to
refer
to
a
painting
by
that
artist
一幅…的作品〔用于著名画家的名字前〕
an
early
Rembrandt
伦勃朗的一幅早期作品
24
used
before
a
name
to
mean
someone
or
something
that
has
the
same
qualities
as
that
person
or
thing
〔用于某人或某物的名字前指与其具有同样特性的人或物〕
She
was
hailed
as
a
new
Marilyn
Monroe.
她被誉为是又一个玛丽莲．梦露。
25
used
before
someone’s
name
when
you
do
not
know
who
they
are
某一，一位〔用于陌生人的姓名前〕
There
is
a
Mr
Tom
Wilkins
on
the
phone.
有个汤姆．威尔金斯先生打电话来。
26
used
before
the
names
of
days,
months,
seasons,
and
events
in
the
year
to
refer
to
a
particular
one
〔用于某一年的日、月、季节和事件前，指具体的日子或事件〕
We
arrived
in
England
on
a
cold
wet
Sunday
in
1963.
1963年一个寒冷、下着雨的星期天，我们来到了英格兰。
I
can’t
remember
a
Christmas
like
it.
我的记忆中不曾有过像这样的圣诞节。
27
an
Before
a
word
beginning
with
a
vowel
sound,
use
.
读音以元音开头的单词前用 an
an
elephant
一头大象
an
umbrella
一把伞
an
obvious
mistake
一个明显的错误
28
an
Use
before
an
‘h’
that
is
not
pronounced.
不发音的 h 前用 an
an
hour
later
一小时之后
an
honest
explanation
如实的解释
29
a
Use
before
a
‘u’
that
is
pronounced
like
‘you’.
u
发 “you” 音时前面用 a
a
university
一所大学
a
unique
opportunity
一个千载难逢的机会
30
an
Use
before
an
abbreviation
that
is
pronounced
with
a
vowel
sound
at
the
start.
读音以元音开头的缩写前用 an
an
SOS
call
一个紧急求救电话
an
MP3
file
一个 MP3 文件