值统    primary system

初波    primary wave

知荷载    primaryload

面积轴    principal axes of an area

惯性轴    principal axis of inertia

应变轴    principal axis of strain

轴变换    principal axis transformation

咒矩    principal bending moment

秩高线    principal contour

著标系    principal coordinate system

著标    principal coordinates

枝变    principal deformation

脂移方向    principal direction of glide

竹荡方向    principal direction of oscillation

朱长比    principal extension ratio

脂移系统    principal glide system

只变量    principal invariant

诌    principal line

钟式    principal minor

诌性矩    principal moment of inertia

著柳    principal net of the flow

吱线    principal normal

纸面    principal plane

钟曲面    principal plane of flexure

脂移平面    principal plane of glide

诌性平面    principal plane of inertia

枝力平面    principal plane of stress

动力学知问题    principal problem of dynamics

助率半径    principal radius of curvature

重面    principal section

拄应力    principal shear stress

郑拟误差    principal simulation error

枝变方向    principal strain direction

枝变比    principal strain ratio

枝力轴    principal stress axis

枝力方向    principal stress direction

枝力法    principal stress method

枝力矩    principal stress moment

枝力比    principal stress ratio

猪面张力    principal surface tension

衷称面    principal symmetry plane

朱迹    principal trajectory