Tools/raw materials: paper, pens, rulers, teaching materials.

1 First of all, write the theme-the understanding of trees.

2. Secondly, draw four arrows with a ruler and take the title as the first branch according to the textbook.

3. Then draw a few arrows behind the title, put the subtitle under the title, and draw a few more subtitles.

The remaining three paintings are the same as the first one.

The last step is to box them with a ruler to achieve the purpose of beauty.

1. Search for "GitMind" in the browser and select "Free Use" after entering official website.

2. Enter GitMind and click "New Brain Map" to create a new blank brain map.

3. Select the central theme, press [[Enter]] to insert the sibling node, press [[Tab]] to insert the child node, and press [Delete] to delete the node.

4. Select the central theme of primary school students' mind map, click the node insert button at the top of the interface, and add peers, subordinates and superiors.

5. Click the "Theme" button on the left to use the theme of mind map provided by the software. If you don't want to use your own theme, you can freely set the connecting lines, borders and rounded corners of the mind map after selecting "Customize".

6. Double-click this node to enter the primary school students' mind map text. Click the text to change the font, size, font color and background color of the node.