artery n.动脉;要道;

arthritis n.关节炎

artificial a.人工的;人造的;

as for (as to)至于;关于

as if (as though)好像;仿佛

ashy n.灰;灰烬;骨灰;遗骸

aspect n.方面;外观;样子

aspiration n.强烈的愿望,志向;渴望达到的目的

assemble v.集合;装配

assess v.评核;估价