a bonanza business的用法和样例：
- His business was far from being a bonanza!
- It's been a bonanza year for the tourist trade.
- What a bonanza for the winning ticket holders!
- It's been a bonanza(ie very profitable)year for the tourist trade.
- Surely the Olympics, a bonanza for business as much as for athletes (see our special report this week), are the fitting symbol for this?