principallyadv.主要地principaladj.主要的；首要的n.本金；资本；校长；主角；委托人；主犯principal optical axis光轴principal mining level主要开采水平Principality of Monaco摩纳哥principal of a college院长Principal Network CCDS主网principal normal plane主法平面principal ideal domain[数]主理想整环principal strain ratio枝变比principal series lines[电] 主系线principal amortization摊还本金