A flat降A调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 question of questions首要问题a marked characteristic显著特征A breezy prose style.风趣的散文文风a compact mass of earth压得很结实的泥土a pair of point charges点电荷对a kidney - line curve类肾脏线A controversial new law有争议的新法律aquo-system indicator[机] 水系指示剂a car of prewar vintage战前型式的汽车a heart-rending story令人心痛的故事