simple ring的用法和樣例：
例句
- A criterion theorem of having no finite coverings for a finitely generated module M over a semisimple ring R is given.
對半單環上有限生成左模給出一個無有限覆蓋的判定定理。 - Numerical simulation shows that the two erbium-doped fiber ring lasers can be well synchronized if the strengths of delay feedback and injection are suitable.
數值模擬表明，在合適的反饋和注入條件下，兩個單環摻鉺光纖激光器能夠達到混沌同步。
