三朝元老

Explanation: Veterans: the oldest, most prestigious veteran. III, originally referred to by the emperor's courtiers reuse. Now used to refer to long-term work in an organization where people who had seniority. 　　Usage: Partial official; as subject, object; refers to veteran 　　Source: Southern Song Fan Ye, "Han Emperor Zhang Ji": "matter section of the line Qiu Xiang Hou Xi III reign, for the elder." 　　Examples: Xiangtang completed, the number of places in which people directly, see the classroom a plaque dawn cloud :"~"。 (Qing Pu "Strange Sanchaoyuanlao")