a deep economic recession的用法和样例：
- The deep economic recession is believed to have been caused, in part, by a severe credit crunch precipitated by a rash of home foreclosures in the United States.
- The medieval town was fortified with a high wall and a deep moat.
- A deep gorge separates the two halves of the city.
- Bankruptcy is a common phenomenon in an economic recession.
- A deep ravine is on the left of the road.