It is narrow in the middle. On top is a large ring-like structure.

VOA: special.2009.03.04

So, we have a problem here if we're thinking about keeping things at the lowest energy, so there's a lot of ring strain in the system.

现在有个问题,我们考虑要把能量降到最低，所以环上有许多应力。

麻省理工公开课 - 化学原理课程节选

But in this movie, the kid gets a little secret decoder ring.

不过在这个电影中，那个小孩得到了一个小的机密解码戒指。

哈佛公开课 - 计算机科学课程节选

Flames quickly surrounded the basket in a perfect ring of fire.

VOA: special.2009.02.28

She's in the running for Song Of The Year for "Single Ladies (Put A Ring On It),"

VOA: standard.2010.01.25

And a soccer ring for kids to play in.

VOA: standard.2010.06.19