2. Use the Zoom tool to reduce the selected edge and the middle of the cylinder.
3. Select the top and bottom surfaces of the cylinder, and then use the Pan tool to move them to the middle position of the reduced cylinder.
4. Enter the Vertex mode, select the vertex, and adjust the shape of the cylinder with the Move tool.
5. Finally, export the model or save it in maya, and the middle of the cylinder can be squeezed in.