ADabbr.(of a date) of the Christian era[缩略] (指年代)公元，公元后[Anno Domini, ‘in the year of the Lord’]■
Usage 用法说明
Strictly, AD should precede a date (e.g. AD 410), but uses such as the tenth century AD are well established. 严格地说， AD 应加在年份前面(如 AD410) ；但现在 the tenth century AD 这样的用法很普遍。