at the cost of 以……为代价

at the expense of 由……负费，以……为代价

at odds with 与……不和

at one with (与)……一致 in league with (与)……密谋

at the mercy of 任凭……的摆布

abandon oneself to 沉湎于

accuse sb of 指责

act on 按照……行事

adapt to 适应

add to 增添

adjust to 适应

aim at 瞄准，针对

allow for 考虑到，顾及

allow of 容许

amount to 合计，共计

answer for 对…负有责任

appeal to 诉诸

apply for sth 请求;申请

approve of 赞成，称许

approximate to 近似，接近

arise from (由…)引起，起源于

ask for 请求，要求

ask after 询问，问候

assist sb. in doing sth. 帮助某人[做某事]

associate with 结交，交往

attend to 注意， 留心，专注， 照顾

attribute to 把…归因于

avail oneself of 利用

absence from 缺席，不在

absence of 缺乏

acquaintance with 相识，了解

access to 接近，进入

affection for 喜爱

answer to ……的答案

appetite for 对……的欲望

approach to 类似，办法，通道

attempt at 尝试，企图

attitude to 态度

at all times 随时，总是

at no time 从不，决不

at one time 曾经，一度

at the same time 同时，然而

at times 有时

against all (the) odds 尽管有极大的困难

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