The specific operation method is as follows:

1. Step 1: In the search box, enter BBK, and then click Search. As shown in the figure below:

2. Next, find the official website of BBK and click Enter. As shown in the figure below:

3. Next, on the homepage, find the title of the download. Click Open. As shown in the figure below:

4. Then, in the download bar, click on the point reader. As shown in the figure below:

5. Then, click on the model as needed. As shown in the figure below:

6. Next, select the teaching materials as needed, and then click Search. As shown in the figure below:

7. Next, find the textbook you want, and then click Download. As shown in the figure below:

8. Finally, select the location where you want to save the file, and then click Download. As shown in the figure below: