a stack of people的用法和样例：
- A group of people are huddling around a stack of smoking bricks.
- Sometimes a stack of people would come there, horseback, from ten or fifteen miles around.
- There is a stack of dishes to be washed in the kitchen.
- 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.