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
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(dá)…; 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(jié); aim at…/對準(zhǔn)..; 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(yīng)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(jìn)攻, 疾病)侵襲，發(fā)作(a heart attack /心臟病發(fā)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(xué), 教堂) ( attend school /上學(xué); attend a lecture /聽講課; attend (at) a wedding /出席婚禮; be attended by/ 由...陪同; 由...照料);
attention n.注意, 關(guān)心, 關(guān)注, 注意力( pay attention to ../注意..);
attitude n.態(tài)度, 看法, 意見(attitude to/towards…/對…的態(tài)度, take [assumed] an attitude of 取…態(tài)度);