a new ring-shaped coulomb potential的用法和样例：
- The economy should be shaped to a new pattern.
- Judy: Is that a new ring? That's a new dress isn't it? Have you been on a spending spree?
- Students are using a new ring tone to receive messages in class -- and many teachers can't even hear the ring.
- I got a new coat in that store last week.
- After inserting a traveller into a new ring and then fitting it on the frame.Put few SLG Ring Grease on its inner flange, it will come into operation without any speed reduction.