Book metaphor:

1. Books are the ladder of human progress.

2. Books are nutritional books in the world and the ladder of human progress.

3. Books are the president of human knowledge.

4. Books are tools for cultivating the soul.

5. Books are tools for cultivating wisdom.

6. Books are the ladder of human progress.

7. Books are the key to wisdom.

8. Books are ladders that help people reach the peak of their ideals.

The heaviest book in the world:

The heaviest book in the world: [English] weighs 2 and a half tons, covers an area of ??41 square meters, and the catalog alone reaches 540,000 pages. 12 years Compiled.

The smallest book in the world: Nanobook. Only 0.07 mm wide and 0.1 mm long, the book is "Teeny Ted from Turnip Town". Two physicists from Simon Fraser University in Canada used a gallium ion beam to scribe the surface of crystalline silicon, a process that took four months.

China's first paper book: "Three Kingdoms".

The largest book in the world: This huge book is 2 meters high and 3 meters wide. This book is the "Duden German Orthographic Dictionary".