a few pages back的用法和样例：
- A few pages of this book are wanting.
- It is impossible to compress the story of the First World War into a few pages.
- We prefixed a few pages to the article on animals.
- A few pages [Two words] were wanting.
- He bought a book and found a few pages missing when he got home.
- It's impossible to compress this mass of material into a few pages.