a rich country的用法和样例：
- It is a paradox that such a rich country should have so many poor people living in it.
- The Rhineland is a rich country and produces food and wine.
- It is a paradox that in such a rich country there should is so many poor people.
- It is a paradox that in such a rich country there should be so many poor people.
- A rich man and his daughter are soon parted.