principal

His principal reason for making the journey was to visit his family..他那次旅程的首要目的是探访家人。

Teaching is her principal source of income..教书是她主要的收入来源。

the principal character in the book.书里的主人公

principal component,主成分；[化]知组分

principal component analysis,主成分分析

principal and interest,本利，本金及利息

principal stress,主应力；枝力，枝动

principal axis,[物]主轴

principal factor,主要因素；主因子法

principal investigator,主要研究者

repayment of principal,还本；偿还本金

principal function,主函数；主要职能

principal strain,主应变，枝变

principal product,主产物

principal direction,纸向；主方向

principal office,总部，总社；总办事处；校长室

principal element,主要因素；主元素

principal character,主人公；主要特征

principal focus,[物]主焦点（等于focal point）

principal tensile stress,汁应力，主拉应力

major principal stress,最大主应力，第一主应力

principal value,本金值；基本价值；主值

principal action,主诉；主要行动