a drum一面鼓aart.一(个)；每一(个)；任一(个)n.英语字母表的第一个字母；学业成绩得优者；表示“最好”的符号A mutant strain of bacteria.突变型菌系A crowd soon gathered round.一群人很快围了上来。A Survey of American Modernism美国现代主义评介a painting of dubious value.价值没法断定的画。A review of nonparametric test非参数检验方法概述a highly marketable newproduct应可畅销的新产品.a beginning or commencement.起源,开始。a dispirited and divided Party气馁的人心涣散的党a colourless liquid like water像水一样无色的液体a team of complete no-hopers完全由无能之辈组成的球队