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;
before adv.在前, 以前; prep.在...之前; conj.在...之前 (the day before yesterday /前天 ); (before - ahead of – prior to在...之前)
begin: (began, begun, beginning) v.开始, 首先( begin to do sth./开始..; to begin with/首先;(begin – start开始)
beginner n. 初学者;
beginning n. 开始, 起点, 开端部分 adj. 初等的, 初级的( at the beginning/从一开始; at the beginning of/在...初; from beginning to end; in the beginning/当初, 开始时);
behalf n. 利益, 代表 (on behalf of/代表, 为了; on sb.'s behalf/以某人的名义, 代表某人);
behavior n.举止, 行为;
behind prep. 在…后面;向…后面;
being (be的现在分词)n. 存在, 存在物(a human being/人; for the time being/暂时, 目前);
belief (pl. beliefs) n. (宗教)信仰, 信心, 信条(have a strong belief in sth. /虔诚地信仰..);
believe v. 相信, 信任(believe sb. /信任某人; believe in/信仰, 信任; believe it or not/信不信由你);
belong v. 属于(to) (belong to/属于);
below prep. 在…的下面, 低于… adv. 在较低处, 在下面
beneath adv.在...之下prep.在...之下, 紧靠着..的底下; (beneath– below – under prep. 在…的下面)
(B级)beneficial adj. 有利[益]的(to), 受益的(be beneficial to/ 有益于); (beneficial - profitable有利[益]的)
benefit n.利益, 好处(benefit - profit利益), v.有益于, 有助于, (常与from, by连用)获益;得益于(for the benefit of/为了...的好处);
beside prep.在…旁边(beside the point/离题; beside oneself/几乎发狂); (beside – near在…的近旁)
besides prep. 除…以外adv. 此外, 而且(besides – in addition此外, 而且) ( besides 和except 都含“除...外”的意思。besides指“除...外, 另外还有”, 着重“另外还有”, 如:I have five other books besides this.除这本以外, 我还有五本别的书。except的含意是“从整体里减去一部分”, 着重于“排除在外”, 如:We all went there except Xiao Li.除了小李以外, 我们都到那儿去 )
best (good 的最高级; well 的最高级) adj.最好的adv.最好地,n 最好的东西(try/do one's best to do sth./尽最大的努力做..; the best and the worst最好的和最差的; make the best of/ 尽量利用; at best/至多)
better (good 的比较级; well 的比较级)adj.较好的，更好的，(健康)好转的adv.更好地,更多地 (Better late than never.(谚)迟做总比不做好; had better do sth. 最好做..; had better not to so sth. /最好不做..);
between prep. 在(两者)之间; 处在...之间 (between一般用于两者之间，而 among用于二者以上)
beyond prep. [表示位置]在[向]...的那边, 在...之外; [表示范围, 限度]超出
bicycle n. 自行车 (ride a bicycle/骑自行车)
big (bigger, biggest) adj.大的, 重要的
bill n. 帐单, 钞票(a 10-dollar bill/一张10美元的钞票; pay the bill for../ 付..的帐单)
billion n. 十亿
bind (bound, bound) v. 捆, 绑, 缚, 扎, (用绷带)包扎(up), 约束, 使粘合(bind up a wound/包扎伤口)
biological adj. 生物学，生物学的;
bird n. 鸟(birds of a feather/同类的人;一丘之貉 kill 2 birds with one stone/一举两得，一箭双雕);
birth n. 出生，诞生，起源(give birth to/生育, 引起)
birthday n. 生日;
bit (bite 的过去式和过去分词) n.小块;少许(a bit (of)/ 有点;稍微; bit by bit/渐渐，一点一点);
bitter adj. 苦的，痛苦的