主部分离

upper part of register take a part of form part of create the part of homologous part of triangle part and parcel of part of speech diameter of part principal axis of compliance principal moment of inertia principal radius of curvature principal part of laurent series principal part of a differential operator principal part principal axes of stress principal direction of curvature principal value of power principal value of argument repayment of principal mind of principal criminal safety of income-principal principal plane of bending