a self-perpetuating caste system的用法和样例：
- I suppose you also have a caste system in your society.
- The caste system is still strong in India.
- Greece must have a system if it is to become a self supporting and self respecting democracy.
- You also have a caste system in England.
- He chronicled the story of a self - made man .
- This book treats of the caste system in India.