abbr.alphabet 字母表,automatic bass compensation 自动低音补偿,automatic brightness control 自动亮度控制,alarms by carrier (panic-button device alerting fire and police stations) 移动警报器（火警和警察局的紧急按钮设备）
Do you know your ABC?
你认识所有的字母吗？
a roving reporter for ABC news
美国广播公司的流动新闻记者
If you want to acquire profound knowledge, you must start from the ABC.
要想造就高深的学问, 就得从基础学起.