a-
①加在单词或词根前面，表示"不，无，非"
acentric
assoial
anormal
imnormal
apoitical
a-
②加在单词前，表示"在…，…的"
asleep
aside
ahead
alive
awish
ab-,abs-
加在词根前，表示"相反，变坏，离去"等。
abnormal
abuse
absorb
abduct
abject
abstract
abstain
abscond
abscise
abstinence
ac-,ad-,af-,ag-,an-,等加在辅音字母前，表示“一再”等强调意
accompany
acelerate
acentutate
accumulate
accustom
addict
adduce
affable
afford
affirm
agression
aggrandize
aggravate
announce
ap-,ar-,as-,at-
加在同辅音字母的词根前，表示"一再"等加强意
appal
applause
appreciate
appoint
arrange
arrest
arrive
assault
assiduous
assist
associate
assimilate
assure
attach
attain
attend
attract
attest
ad- 加在在单词或词根前，表示"做…，加强…"
adapt
adept
adopt
adhere
adjacent
adjoin
administrate
admire
adumbrate
adjust
adventure
admonish
advent
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