principal

校长, 首长, 本金, 主犯, 资本, 委托人

the original amount of a debt on which interest is calculated; the educator who has executive authority for a school; capital as contrasted with the income derived from it; (criminal law) any person involved in a criminal offense, regardless of whether the person profits from such involvement

主要的, 最重要的, 首要的

校长