principle part主体principlen.原理；原则；主义；信念principle of statistics统计学原则principle of similitude相似原理,相似法则principle-agent model委托代理模型principle of innovation创新性原理principle of neutrality中性原则principle-agent chain委托代理链principle of digital TV数字电视原理principle of conformity整合原则principle of materiality重要性原则principle of culpability归则原则