arithmetic[E5rIWmEtIk] n.[U]算术，计算：business arithmetic 商业算术 / He is good at arithmetic. 他擅长算术。
【联想】geometry[dVI5CmItrI] 几何 / algebra[5AldVIbrE] 代数 / function[5fQNkFn] 函数 / calculous[5kAlkjJlEs] 微积分(学)
arrow[5ArEJ] n.1. [C]箭：Time flies like an arrow. 光阴似箭。2. [C]箭头：direction arrows 方向箭头
ashamed[E5FeImd] adj.惭愧;害臊：Are you ashamed for having lied? 你为撒了谎感到害臊吗? / I am ashamed for you. 我替你感到羞愧。/ You should be ashamed of your behavior. 你应该为你的行为感到羞愧。
【辨析】ashamed与shameful：ashamed 意为“感到羞耻的”，shameful 意为“可耻的”、“丢脸的”：You should be ashamed of doing that. 你应该为自己做那样的事感到羞耻。It was shameful of them to surrender. 他们的投降是可耻的。
aside[E5saId] adv.在旁边;向旁边：Stand aside and let these people pass. 靠边站，让这些人过去。n.[C](戏剧中的)旁白;独白◆aside from (1)除…之外(别无)：Nobody, aside from him, could answer this question. 除他外，没人能回答这个问题。(2)除…之外(尚有)：Aside from being fun and good exercise, swimming is a very useful skill. 除了是乐趣和有益的锻炼外，游泳还是一种很有用的技能。(3)除…外，如果不考虑：Aside from the rainy weather, our vacation was fun. 除了天气阴雨外，我们的假期还是玩得很高兴的。
【说明】aside from为美国英语，在英国英语中用apart from代之。
astronomy[E5strRnEmI] n. [U]天文学：I’m very interested in astronomy. 我对天文学很感兴趣。
atom[5AtEm] n.1.[C]原子：Water is made up of atoms of hydrogen and oxygen. 水是氢和氧的原子构成的。/ Everything on the earth is made up of atoms. 地球上的每一种东西都是由原子构成的。2.[C]微粒，微量：There is not an atom of truth in what he said. 他所说的话没有丝毫真实性。/ There is not an atom of truth in the rumour. 这谣言一点也不真实。
atomic[E5tCmIk] a.原子的，原子能的，原子武器的
automatic[7R:tE5mAtIk] a.1.自动的，机械的：an automatic washing-machine 自动洗衣机 / automatic alarm 自动报警 / The heating system in the hotel has an automatic temperature control. 旅馆里的取暖系统是自动调温的。2.不假思索的，无意识的：She knew the lesson so well that her answers were automatic. 她对这一课极为熟悉，可不假思索地随口回答问题。/ Most of our movements are automatic. 我们人体的大部分动作都是无意识的。3.必然的，自然的：A fine for this offence is automatic. 对于这种过失，罚款是必然的。
avenue[5AvEnju:] n.1. [C](城市的)林阴路，大街：an avenue of poplars 白杨树的林阴大道2.[C]方法;途径：Several avenues are open to us. 我们面前有几条可行之路。
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