1.aluminum n.鋁

例:Air pollution from the giant aluminum refinery is killing our plants.

2.alumna n.女校友，女畢業生(a female former student of a school, college or university)

3.alumnus n.男校友，男畢業生(a male former student of a school, college or university)

例:He is an alumnus of Peking University of the class of 1986.

4.amalgam n.混合物( combination)

詞根記憶：本義是“汞合金”，該詞來自拉丁文amalgama(混合)；聯想記憶：am+alg+am，前后兩個am結合--混合

例:amalgam of Chinese and Western medicines中西藥合劑

派生詞:amalgamate(v.合并，聯合)：amalgamation(n.混合，合并)

5.amass v.積聚(to gather,accumulate)

詞根記憶：a+ mass( -團)--變成--團--積聚

例:While in college, John amassed a shelf of reference books.

派生詞:amassment(n.積蓄，聚積)

同根詞：massive(a.巨大的)

6.amateur n.業余愛好者(one who practisesa sport or art without receiving money for it one who is unskilled or inexperienced in an activity)

詞根記憶：amat( =amor愛)+eur（人)--愛好的人--業余愛好者

例:He is an amateurin boxing.

派生詞:amateurish(a.業余愛好的；不熟練的)

同根詞：amorous(n.多情的)

7.amber n.琥珀( hard clear yellowish brown gum )

發音記憶：“愛不”--愛不釋手的珍物--琥珀

8.ambiguity n.模棱兩可，模糊(uncertainty)

詞根記憶：ambi(繞著，在什么周圍)+guity--圍著什么繞來繞去--模棱兩可

例:The ambiguityof the teacher's response made us realize he did not know the answer.

9.ambiguous a.意義不明的，模棱兩可的( obscure)

例:The professor gave an ambiguous answer to Jane's question.

10.ambitious a.有抱負的，雄心勃勃的( having a desire to achieve a particular goal);宏大的( an idea or plan on a large scale and needs a lot of work to be carried out successfully)

例:Over the last ten years, overcrowding in the prisons of Barraland has essentially been eliminated as a result of an ambitious program of prison construction.

派生詞:ambitiously(ad.雄心勃勃地：熱切地)

同根詞：ambition(n.野心)