When the novel narrated the story of me and Steamed Bun, it mentioned many times that another student might have the following uses: 1. Character Creation: By describing another student's personality, appearance, experience, etc., the reader can better understand the character and deepen their understanding of the story and emotional resonance. Prominent theme: The existence of another student in the novel may help to highlight the theme or emotional content of the story. For example, through the interaction and interaction with another student, it can show the complexity and variety of human nature or express the values of friendship, love, trust, etc. 3. Driving the plot: The existence of another student may have an important impact on the plot and thus promote the development of the story and emotional ups and downs, such as playing some key roles in the story or playing a key role in the turning point. 4. Increase interest: The existence of another student in the novel may increase some interest and legibility. For example, through the interaction and conflict with the steamed bun, it shows different personality traits and behaviors to make the readers have more surprises and imaginations.