Look, there's a central axis.

您看，中间是一条中轴线。

The entrance door revolves on a vertical central axis.

入口大门围绕着一个垂直中轴旋转。

The said flange connected with the central axis is a polygon.

所述的与中心轴连接的法兰盘为多边形。

To turn around or as if around a central axis; revolve or rotate.

旋转围绕或仿佛围绕一中心轴而转动；盘旋，旋转。

To cause to turn around or as if around a central axis; revolve or rotate.

旋转使盘旋，使仿佛绕着一中心轴旋转；旋转，回旋。