Create a cover image based on the core content of the article to use as the cover of your notebook.

Images should be hand-drawn cartoon style, with a 3:4 aspect ratio. They should have a consistent, bold pencil-drawn style, be informative, use a solid color background, and include a clear, prominent title. Use the nano_banana tool to generate the images. Output Chinese characters within the images. The background should be a pure white. The aim is to encourage users to click and browse the article content.