a bumper crop的用法和样例：
- The benign weather brought North America a bumper crop.
- Indications point toward a bumper crop.
- Farmers have reported a bumper crop this year.
- A bumper crop remunerated the peasant for his labour.
- We are looking forward to a bumper crop(= a very large one).
- The farming was done intensively for no other reason than a bumper crop.