principaladj.主要的;首要的n.本金;资本;校长;主角;委托人;主犯
principal host主要宿主
principal risk主要风险
principal term主项
principal book主要帐簿
principal link[化] 主键
principal root主根
principal data基本数据
principal base主要基面
principal path主要路线
principal crop主林木
"he is mainly interested in butterflies"