| | No. | Topic words’ description | Corresponding feature |
| | Topic 0 | Speed, delivery, ship, logistics | Logistics quality | | Topic 1 | Text, delicate, idea, illustration | E-book content | | Topic 2 | Plot, characters, story, novel | E-book content | | Topic 3 | Cover, version, font, set of books | Book packaging | | Topic 4 | Paper, package, printing, genuine | Book packaging | | Topic 5 | Recommend, suggest, collect, a good book | General description | | Topic 6 | After reading, beautiful, satisfied, five-star review | General description | | Topic 7 | Emotion, narration, realize, principle | E-book content | | Topic 8 | Author, heart, life, experience | Biography | | Topic 9 | Chinese version, style, English version, background | E-book content |
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