a bonanza farm的用法和样例：
- His business was far from being a bonanza!
- It's been a bonanza year for the tourist trade.
- It's been a bonanza(ie very profitable)year for the tourist trade.
- Ethanol subsidies and “agflation” have brought a bonanza to the farm states.Agricultural exports are up almost 20% compared with 2006, while farm incomes are growing smartly.