a deep book的用法和样例：
- This is a deep book.
- The medieval town was fortified with a high wall and a deep moat.
- A deep gorge separates the two halves of the city.
- A deep ravine is on the left of the road.
- A deep melancholy runs through her poetry.
- She had just woken from a deep sleep.
a deep book的相关资料：