Anfa安法anart.（用在元音音素前）一an hour and a half一个半小时an infallible rule确实的规则an iced watermelon冰西瓜an imperative duty紧急任务an isolation booth隔音室angiographic agent血管造影剂an inexorable will不可动摇的意志ankylosis of tooth牙骨粘连, 牙齿固连an astounding card奇怪的人,妙人an all-star cast全明星阵容