a stack of books的用法和样例：
- There is a stack of dishes to be washed in the kitchen.
- The professor, whose hobby was photography, had also left an unexposed photographic plate under a stack of books on a table in the same room.Later he used the plate to take a picture of some scenery.
- There are a stack of replies to our advertisement.
- A stack of hay or other feed stored in a barn.
- A stack of files awaited me on my desk.
- There are a stack of replies to our advertisement .