aner雄蚁anart.（用在元音音素前）一an uneven contest.力量悬殊的比赛an insoluble problem无法解决的问题an embarrassing slip令人难堪的失误An offer on approval试销报盘an air/oil filter空气过滤器；滤油器an experimental drug试验性的药物Anesthetic induction麻醉诱导an untouched subject未论及的主题an intrepid explorer勇敢的探险家an apodeictic theory毫无疑问的理论