be absent from 缺席不在
He has been absent from his desk for two weeks.

be absorbed in 专心于，致力于
They are completely absorbed in each other.

abundant in 富于
Birds are abundant in the tall vegetation.

acceptable to 可接受的，值得接受的
If something is acceptable to someone

acquainted with了解，相识，熟悉的
He was well aquainted with the literature of France, Germany and Holland

adjacent to 毗邻
He sat in an adjacent room and waited.

alert to 对...警觉
She is alert to that stranger.

alien to 不相容，与...相反
Such an attitude is alien to most businessmen.

amazed at对...感到惊讶
I was amazed at her knowledge of French.

angry with sb对（某人）生气
annoy at＼about sth with sb
He get very annoyed with me about my carelessness.

anxious about sth/for sb对某人（某事）担忧
He seemed anxious about the meeting
Parents are naturally anxious for their children.

appropriate to 适用于
Dress neatly and attractively in an outfit appropriate to the job.

apt at 聪明，善于
Babies are apt to put objects into their mouths.