age n. 年龄 v. 变老(at the age of…/时年..岁; be of age(= come of age/)成年 ;
ago adv. 以前，以往(long long ago很久很久以前, two days ago/两天前);
agree v. 一致, 相合, 同意 (agree on…/对…意见一致; agree with sb. /同意某人的话; agree to do sth. 同意做… );
agreement n. 一致, 同意, (in agreement with .../和..一致);
agriculture n.农业
ahead adv.在前, 向前, 提前( ahead of…/在…之前;超过);
aid v. 帮助, 援助 n. 帮助, 支援(aid sb. in sth./ 帮助某人做。。);(aid – help帮助; aid –device辅助设备)
aim v. (常与at连用)瞄准, 对准, 以…为目标n. 瞄准;目标(aim to do sth./致力于做。。;aim at doing sth./sth. /致力于做…) ;
air n. 空气, 天空(fresh air /新鲜空气; by air /乘飞机);
airplane n. 飞机;
airport n.航空站,机场 ;
alarm n. 惊恐，担忧，报警器， 闹钟，警报v. 使担心，使惊恐
alcohol n. 酒精;
alike adj. [常作表语]同样的, 相似的(look alike/看起来相似)
alive adj. 活的，活着的( keep sth alive/让。。仍然活着 );(比较: alive(活的)不能作定语, 只能作表语和补语; living(活的) 可以作定语, 如: a living scientist 一位仍然还在世的科学家)
all adj. 所有的, 全部的pron.全体, 全部, (与of连用)整体;全部(in all/总计; above all/首先，尤其是, all over/到处，遍及, after all/终究，毕竟, at all/完全， 根本， 究竟; after all/虽然这样， 毕竟);
allow v. 允许，准许, 给予 (allow sb. to do sth./允许某人做。。)(allow –permit允许)
almost adv. 几乎;(almost –nearly几乎,差不多)
alone adj. [只作表语] 单独的; 孤独的(be alone/独自一人， leave sb. alone/让某人独自呆一会)(比较: lonely(孤独的)可以用作表语)
along prep. 沿着(walk along the river/沿着河走; all along/始终;一直 ;along with/与…一道);
aloud adv. 高声地，响亮地 (aloud –loudly高声地)
already adv. [表示现在或过去某时已发生的事实] 已经
also adv. 也, 同样, 而且(not only..but also...或 not only...but../不仅..而且…); (also –too –as well也)
alter v. 变更;改变，改换 (alter –change改变)
alternative n. 两者择一, 替换物， adj. 两者择一的,交替的;
although adv. 尽管，虽然; (although – though 虽然)
always adv. 总是;
a.m. adv. 上午
amaze v. 使惊奇;使吃惊(be amazed at sth. /对...感到惊奇);(amazed –surprised – astonished 感到惊讶的 )
amazing adj. 令人吃惊的 (amazing – surprising – astonishing 令人吃惊的)
ambition n. 野心, 雄心, 抱负;
ambitious adj. 野心勃勃的，渴望的
