assembly n. 集合, 裝配, 集會（assembly line/裝配線）；
assess v. 評估(財產, 價值, 人物、工作等)； (assess – evaluate – value評估)
assist v. (在某方面)幫助，援助，協助 ((assist sb. in doing sth/to do sth/在…方面幫助某人))
assistant n. 助手, 助理(assistant engineer/助理工程師; assistant professor/副教授);
associate v. 結交, 由...聯想到..., 把...聯系起來(associate one thing with another/把某一事與另一事聯系起來; ...be associated with sth./...和...有關/...和...有聯系):
association n. 聯合,協會, 社團:
assume v. 假設(assume – suppose ),承擔(assume – take on - acccept), 呈(態度, 姿態, 位置) (assume new duties/承擔新的職務; assume office/就職; assume responsibility/負責, 承擔責任);
assure v. 保證 (assume - ensure) ，使安心，讓…放心 (assure sb. of/that…/向某人保證…)
astonish v. 使吃驚(astonish – surprise –shock)(be astonished at sth. /對…感到驚訝);
astronaut n. 宇航員 www.examｗ.com
at prep.[位置， 場所， 地點，時間]在…時，在…中，在…方面，向，（表示速度，價格等）以(arrive at…/到達…; at my uncle's/在我叔父家;at the foot[top] of the mountain /在山腳下[頂上]; at the meeting/在會議上; at ten o'clock/在十點鐘; at (the age of) forty/在 40 歲的'時候; at the beginning of the month/在月初; at Christmas/在圣誕節; aim at…/對準..; throw …at …/朝…扔…;be pleased at…/對…感到高興;be surprised [frightened] at …/聽到…而吃驚; at one's request/應某人的請求; at the rate/speed of …/以每小時..速度);
athlete: n. 運動員
Atlantic adj.大西洋的；大西洋沿岸的(the Atlantic Ocean /大西洋);
atmosphere n. 大氣, 空氣, 氣氛;
attack n./v. 進攻, 疾病）侵襲，發作(a heart attack /心臟病發作);
attach v. 貼上，系上，縛上(attach… to … 把…貼/系在…上面)
attempt n. （常與at, on, to連用）努力, 嘗試v. （常與to連用）企圖, 嘗試 (attempt to do sth./make an attempt to do sth. /試圖做…);
attend v. 注意, 出席(at), 參加, 上(學, 教堂) ( attend school /上學; attend a lecture /聽講課; attend (at) a wedding /出席婚禮; be attended by/由...陪同; 由...照料);