1. abandon:  [vt] 抛弃；离弃；中止；放任  [n] 放任 
例：We had no option but to abandon the meeting.
abandon oneself to accessible反义词前缀沉湎于
例：We are scared to abandon ourselves to our feelings in case we seem weak or out of control.  我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。
2. able:  [adj] 能…的；有才能的；能干的
be able to do sth.      an able designer
ability  [n]
disable  [vt]  disabled  [adj]  disability  [n]
disabled people  残疾人
3. abnormal:  [adj] 反常的；变态的
abnormalism:  [n] 变态性，反常性  abnormally:  [adv]
abnormality:  [n] 反常；畸形；不合常规的现象或事件 
heart abnormality  心脏畸形
ab-:前缀，相反的 
normal  normally  normalize  normality常态
normal university  师范大学
back to normal
4. aboard:  [adj&adv] 在船（火车、飞机）上
例：Welcome aboard! 欢迎乘坐本次航班（本班船）！
abroad:  [adv&adj&n]
from abroad  travel abroad  go abroad
5. abolish:  [vt] 废除；废纸；革除
例：These reforms will abolish racially discriminatory laws.
这些改革措施将彻底废除带有种族歧视的法律。
abolisher  abolishment
6. abort:  [vt] 使流产，使终止（火箭、宇宙飞船、计划）
abort a trip      a launch abort
abortion  [n]  流产；堕胎；失败
例：She decided to have an abortion / abort the pregnant.
例：His attempt proved an abortion.
7. abrupt:  [adj] 突然的；唐突的
例：The bus came to an abrupt stop.公共汽车突然停下。
abruptly    abruptness
8. absence:  [n] 缺席，缺乏
in the absence of      absence of mind
absent:  [adj&vt]      absent-minded
例：He absented himself from school yesterday.
9. absolute:  [adj]  绝对的；完全的；确实的
in absolute terms  从绝对意义上说
absolutely 
10. absorb: [vt] 吸收；吸引；理解；占用（时间）
absorb one’s attention  absorb the meaning of 
absorbed: [adj]  be absorbed in 全神贯注地，专注于
11. abundant: [adj] 丰富的，充足的
be abundant in 
例：Sea is abundant in all kinds of creatures.
abundance: [n]  in abundance
例：He wished to have money in abundance.
12. abuse: [n&vt] 辱骂；滥用；恶习；虐待
the abuse of privilege      abuse the authority
例：What went on here was an abuse of power.
这里所发生的事是一种滥用职权的行为。
abusive    abusiveness
13. academic: [adj] 学术的；学校的；学习良好的
academic work 
academically   
academy
academician 
14. accelerate: [vt&vi] 加快，促进
accelerate the world peace
例：We will accelerate the development of an environment-friendly society.
加快建设环境友好型社会
acceleration    accelerative
15. accept: [vt] 接受；同意
accept an invitation    accept one’s apology
acceptance/acception      acceptable
16. access: [n] 进入；通道  [vt] 获取
have/give/get access to
例：The only access to the library is across the bridge. 
accessible  易接近的；易理解的；易取得的，易相处的
例：The documents are not accessible to the public.
be accessible to beginners
an accessible person
17. accommodate: [vt&vi] 容纳；提供；使适应；调节；适应
例：This house can accommodate 100 people.
The eye can accommodate itself to seeing objects at different distances.
accommodation [n] 膳宿；住处；座位；和解；方便
例：First class accommodation is available on all fights.
It’s a great accommodation to me.
book accommodation at a hotel
come to an accommodation
18. accompany: [vt] 陪伴；伴随；伴奏
例：Lightning usually accompanies thunder.
You sing and I will accompany you on the piano.
accompany sb =keep sb. Company
19. accomplish: [vt] 完成；实现
accomplish one’s goal
accomplishment
20. accord: [n&vt&vi] 一致
in /out of accord with sb. 与某人意见一致/不一致
according to
accordingly