单词	family instruction
释义	英華☞private education
随便看	center of mean distance center of moment center-of-momentum center of momentum frame｛=cm｝ center-of-momentum system center of motion center of origin center of oscillation center of oscillation of pendulum center of ossification center of pencil center of pendulum center of percussion center of perspective center of perspectivity center of planning area center of pressure center of pressure (cp) center of pressure moment center of pressure travel center of projection center of projection（station point） center of propulsion center of pull center of push