台阶部分具有环形凸形部分，该环形凸形部分与环形凹形部分连接，并使得中心面板的至少一部分沿平行于纵向轴线的方向而垂直位移。
The step portion has an annular convex portion joined to an annular concave portion and displaces at least a portion of the center panel vertically in a direction parallel to the longitudinal axis.
台阶部分具有环形凸形部分，该环形凸形部分与环形凹形部分连接，并使得中心面板的至少一部分沿平行于纵向轴线的方向而垂直位移。
The step portion has an annular convex portion joined to an annular concave portion and displaces at least a portion of the center panel vertically in a direction parallel to the longitudinal axis.
应用推荐