assembly n. 集合, 装配, 集会（assembly line/装配线）；

assess v. 评估(财产, 价值, 人物、工作等)； (assess – evaluate – value评估)

assist v. (在某方面)帮助，援助，协助 ((assist sb. in doing sth/to do sth/在…方面帮助某人))

assistant n.  助手, 助理(assistant engineer/助理工程师; assistant professor/副教授);

associate v. 结交, 由...联想到..., 把...联系起来(associate one thing with another/把某一事与另一事联系起来; ...be associated with sth./...和...有关/...和...有联系):

association n. 联合,协会, 社团:

assume v. 假设(assume – suppose ),承担(assume – take on - acccept), 呈(态度, 姿态, 位置) (assume new duties/ 承担新的职务; assume office/就职; assume responsibility/负责, 承担责任);

assure v. 保证 (assume - ensure) ，使安心，让…放心 (assure sb. of/that…/向某人保证…)

astonish v. 使吃惊(astonish – surprise –shock)(be astonished at sth. /对…感到惊讶);

astronaut n. 宇航员

at prep.[位置， 场所， 地点，时间]在…时，在…中，在…方面，向，（表示速度，价格等）以(arrive at…/到达…; at my uncle's/在我叔父家;at the foot[top] of the mountain / 在山脚下[顶上]; at the meeting/在会议上; at ten o'clock/ 在十点钟; at (the age of) forty/在 40 岁的时候; at the beginning of the month/ 在月初; at Christmas/在圣诞节; aim at…/对准..; throw …at …/朝…扔…;be pleased at…/对…感到高兴;be surprised [frightened] at …/听到…而吃惊; at one's request/应某人的请求; at the rate/speed of …/以每小时..速度);

athlete: n. 运动员

Atlantic adj.大西洋的；大西洋沿岸的(the Atlantic Ocean /大西洋); 

atmosphere n. 大气, 空气, 气氛;

attack n./v. 进攻, 疾病）侵袭，发作(a heart attack /心脏病发作);

attach v. 贴上，系上，缚上(attach… to … 把…贴/系在…上面)

attempt n. （常与at, on, to连用）努力, 尝试v. （常与to连用）企图, 尝试 (attempt to do sth./make an attempt to do sth. /试图做…);

attend v. 注意, 出席(at), 参加, 上(学, 教堂) ( attend school /上学; attend a lecture /听讲课; attend (at) a wedding /出席婚礼;  be attended by/ 由...陪同; 由...照料);

attention n.注意, 关心, 关注, 注意力( pay attention to ../注意..);

attitude n.态度, 看法, 意见(attitude to/towards…/对…的态度, take [assumed] an attitude of 取…态度); 

attract vt. 吸引(attract –appeal to), 诱惑(attract one’s attention/引起某人注意);

attractive adj. 有吸引力的(attractive – appealing ), 漂亮的(attractive – beautiful – pretty );

attribute vt. 把...归因于(to)..., n.属性, 特质, 标志(attribute ..to ../ 把...归因于);

audience n. 听众, 观众, 读者(a large audience/很多观众);

August n.八月(略作Aug);

aunt n. 伯母, 婶母, 舅母, 阿姨;

Australia n. 澳大利亚，澳洲:

author n. 作家, 著者(best author畅销书作者; joint author/合著者);

authority n. 权威, 权力, 权势, [pl.]当局, 负责人; 

automatic adj.自动的,机械的;

automobile n.汽车，小汽车;

autumn n. 秋, 秋季(美国普通称fall) (in autumn/在秋天; in (the)late autumn/在晚[深]秋);

available adj.可用到的, 可利用的, 有用的, 有空的;