所有科技知识-科学时代

科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。

principal and interest	principal angle	principal angle of incidence	principal aspect of a contradiction	principal at face value
principal auditor	principal auditor	principal axis	principal axis	principal axis
principal axis	principal axis	principal axis of inertia	principal axis of inertia	principal axis of inertia
principal axis of inertia	principal axis transformation	principal belligerent	principal block	principal boy
principal budget factor	principal bundle	principal carrier	principal cause of death	principal cell
principal challenge	principal clause	principal component	principal component analysis	principal component analysis
principal component analysis	principal component analysis	principal component analysis （PCA）	principal component estimate	principal component regression analysis
principal components analysis	principal component transformation	principal congruence	principal contour	principal contract
principal contractor	principal contradiction	principal coordinate	principal coordinate analysis	principal coordinates
principal coordinates	principal crop	principal current	principal curvature	principal curvature
principal curvature	principal curve	principal debtor	principal deformation	principal deformation
principal dimension	principal direction	principal direction	principal direction	principal distance error
principal distance of camera	principal distance of photo	principal distance of photo	principal distance of projector	principale
principal earthquake	principal edition	principal edition	principal elongation	principal epipolar line
principal epipolar plane	principal establishment	principal extension ratio	principal factor analysis	principal factor analysis
principal factor analysis	principal felling	principal financial indicator	principal focal distance	principal focus
principal focus	principal force	principal forest crop	principal forest product	principal function
principal genus	principal girl	principal husband	principal idempotent element	principal instalment
principal, interest，taxes, and insurance (PITI)	principal in the first degree	principal in the second degree	Principality of Bulgaria	principal lecturer
principal line	principal line	principal line of photograph	principal load	principal lunar semidiurnal constituent
principal male dancer	principal manufacturer	principal market	principal maximum	principal maximum
principal medical officer	principal meridian	principal meridian	principal minor	principal minor
principal minor	principal moment	principal moment of inertia	principal moment of inertia	principal money
principal normal	principal note	principal obligation	principal optic axis	principal orientation direction
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