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1.aluminum n.铝 例:Air pollution from the giant aluminum refinery is killing our plants. 2.alumna n.女校友，女毕业生(a female former student of a school, college or university) 3.alumnus n.男校友，男毕业生(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) 词根记忆：本义是“汞合金”，该词来自拉丁文amalgama(混合)；联想记忆：am+alg+am，前后两个am结合--混合 例:amalgam of Chinese and Western medicines中西药合剂 派生词:amalgamate(v.合并，联合)：amalgamation(n.混合，合并) 5.amass v.积聚(to gather,accumulate) 词根记忆：a+ mass( -团)--变成--团--积聚 例:While in college, John amassed a shelf of reference books. 派生词:amassment(n.积蓄，聚积) 同根词：massive(a.巨大的) 6.amateur n.业余爱好者(one who practisesa sport or art without receiving money for it one who is unskilled or inexperienced in an activity) 词根记忆：amat( =amor爱)+eur（人)--爱好的人--业余爱好者 例:He is an amateurin boxing. 派生词:amateurish(a.业余爱好的；不熟练的) 同根词：amorous(n.多情的) 7.amber n.琥珀( hard clear yellowish brown gum ) | 
