三朝元老　

◎ 三朝元老 sān cháo yuánlǎo

(1) [a veteran statesman who have served three emperors in a row]∶原指先后受三世皇帝重用的大官;后用來諷刺在幾個王朝當官的人

(2) [the most senior employee in a government organization]∶在某個政府部門任職很久,已經(jīng)經(jīng)歷了幾個領導的人,也比喻在一個部門工作時間長、資格老的人