a grassy lawn的用法和样例：
- They are lying on a grassy lawn.
- A grassy lawn, embraced by crape myrtle woods, sprawls to the north of the Lotus Pavilion.
- A deer couched on a grassy bank .
- They sat and had their lunch on a grassy hillside.
- A deer couched on a grassy bank.
- Children make the roll down a grassy hillside.