椭圆之长短轴线
major axis and minor axis of an ellipse
双轴半椭圆弹性铰链
double-axis half-ellipse flexure hinge
半椭圆表面裂纹
semi-ellipse surface crack
weak interface
half-ellipse surface crack
semi-elliptical surface crack
半椭圆回转式井壁底
semiellipse rotation type
半椭圆形弹簧
half-elliptic spring(semi-elliptic spring
semi elliptic spring
half elliptic spring
semi-elliptical spring
half-elliptic spring
半椭圆形垄
ridge of half ellipse shape
表面半椭圆裂纹
semi-elliptical surface crack