A Class of Finite Rings的用法和样例：
- Pele was in a class of his own as a footballer.
- It's no easy task to take control of a class of young children.
- Based on the asymptotic properties for numerical Integral formulas, this paper obtains a class of finite difference methods for solving initial value problems of Odinary Differential Equations, and studies the consistency and stability of new methods.
- A class of people regarded as stupid and gullible.
- She taught a class of 30 pupils.