a field of corn的用法和样例：
- There is a field of corn in front of the village.
- A field of corn awaits harvest in Mexico, where cornmeal is a dietary staple.
- Crows all but destroyed a farmer's field of corn.
- The peasants are reaping a field of barley.
- Crossing the small town by riding, we can find a field of corn and lawn, scattered about which, are many beautiful houses.
- A field of study chosen as an academic specialty.