椭圆齿轮行星系分插机构
transplanting mechanism with planetary elliptic gears
裂纹－圆－椭圆模型
crack-holeellipse interaction model
树结构椭圆簇分裂
tree structure ellipse cluster split
直圆椭圆
right circular elliptical
电机机构
motor operating mechanism
光机机构
optical mechanical construction
卸载机机构的工作
unloader mechanism operation