precursor
n.
early 15c., from Middle French precurseur and directly from Latin praecursor "forerunner," agent noun from past participle stem of praecurrere, from prae "before" (see pre-) + currere "to run" (see current, adj.). Related: Precursory.
〔蒋〕[pre-先，前，curs跑→行，-or者] 先行者，先驱者，前任，前辈
〔李〕[pre-=before前；curs=to run跑；-or n.=person人→“person running before others跑在他人前面的人”→] n. forrunner;predecessor先行者；前辈