a tree一棵树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 strict code of conduct严格的行为准则A word in this degree.原级词原级形容词或副词a multilateral agreement多边协议a winter sports carnival冬季体育运动会A collateral relative.旁系亲属a refreshment concession租地设小吃摊的营业权a warm comfortable house温暖舒适的房子A pair of football boots一双球鞋a bohemian life style.放浪不羁的生活方式。a froth of entertainment一阵短暂的娱乐