2. Then draw the first layer. Starting from the central theme, draw the first-level concepts related to the theme, such as axis symmetry, translation and rotation.

3. Then draw the second layer. Under each first-level concept, draw the second-level concept related to it. For example, translation includes left-right translation and up-and-down translation.

4. Then draw the third layer. Under each second-level concept, draw the third-level concept related to it, such as axisymmetric graphics under axial symmetry.

5. Finally, improve the mind map and add colors and small patterns to make it more vivid and interesting.