A revolving body is a curved surface formed by the rotation of a bus around a fixed axis, which is called a revolving surface. A surface is a revolution surface or a solid with a plane and a revolution surface, which is called a revolution body. A common curved surface in engineering is a rotating body.
Rotating body can be replicated in space by rotating operation. In the process of rotating, all parts rotate to a fixed position to form the same shape, and the final shape is called rotating body.