And when I turned 16, I had it made into a ring and we discovered it was actually a star sapphire and not a black pearl.

VOA: standard.2010.05.31

Benzene is a ring that's made up of six carbon atoms and six hydrogen atoms.

苯环是一个由六个碳原子,和六个氢原子组成的环。

麻省理工公开课 - 化学原理课程节选