amMORNING a.m. .eI5em adv [not gradable] used when referring to a time between twelve o'clock at night and twelve o'clock in the middle of the day 午前,上午 The most expensive time to use the phone in Britain is between 8 am and 6 pm on a weekday. 在英国,电话费最贵的时段是工作日的上午8点到下午6点。 The first election results are expected around 1am. 第一轮的选举结果预计将于凌晨1点左右揭晓。 ☆ PM