1. Draw a curved bushing coil from the drawing center. After drawing, press "Enter" to end the drawing command.

2. Click the Modify panel under the Home tab, and then select the Region command, or enter the Regen command to select a region.

3. Use the left mouse button to select the whole winding area of the bending bushing, and press the "Enter" key to generate a closed area, prompting that "Select object:" appears.

4. Press the "Enter" key again, enter the region filling command, and the "HatchandGradient" dialog box will pop up. In the dialog box, select the appropriate filling type and color, set other parameters, and then click OK to complete the filling.