a litter of puppies的用法和样例：
- His dog hasn't had a litter of puppies.
- She must have been quite different before - like a bitch that has to go searching for food even when she is about to bear a litter of puppies!
- Our cat has a litter of four kittens.
- Her desk was covered in a litter of books and papers.
- The cat dropped a litter of four kittens.
- The desk was covered with a litter of documents.