a-c[化] 交流; 交变电流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 throwing upward.上抛，上投a leak in the boiler锅炉的裂隙a conditioned reflex条件反射a few drops of water几滴水A digestive agent.消化器官a storm of criticism猛烈的抨击a peace offensive.和平攻势a confirmed bachelor准备一生打光棍的单身汉A long aftertaste.余韵悠长。a concordant society和谐社会