短語詞組短語principal central axis 中心主軸線principal l axis 主軸principal strain axis 主應變軸principal stress axis 枝力軸;應力主軸principal centroidal axis 主形心軸principal rotation axis 主轉(zhuǎn)動軸principal stress axis rotation 主應力軸鏇轉(zhuǎn)central principal inertia axis 中心主慣性軸principal optic axis 主光軸;繙譯 返回 principal axis