a vast stretch of forest的用法和样例：
- There are a vast stretch of flush on his back.
- A vast stretch of corn is growing on the ridge.
- But radiation infects a vast stretch of Ukraine, Belarus and Russia - in the soil, in the berries and mushrooms, in the firewood needed to heat homes.
- A young traveler was exploring the Alps. He came upon a vast stretch of barren land. It was desolate. It was the kind of place you hurry away from.