Friedrich Kekule discovers the unique ring like structure of the molecule benzene right after he wakes up from a day-dream about snakes chasing their own tails and forming rings.

弗里德里希·凯库勒发现分子苯的结构想一个环状的客观事实，正是醒于当天的一个白日梦后知道的，在梦里他梦见一群蛇都在追逐着各自的尾巴，于是形成了好多环形。

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With this distinctive central star-forming ring, and the addition of numerous bluish clusters of hot, young stars dotted through its spiral arms, NGC 1097 makes a stunning visual object.

有着与众不同的中心恒星环，旋臂上还点缀着大量炽热的年轻恒星组成的蓝巨星簇，NGC 1097就成为绝佳的观测目标。

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All machines exchange information using the same port number, thereby forming a ring for communication.

所有的计算机使用相同的端口号来交换信息，因此形成了一个通信环。

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Besides clean-up of materials, the company plans to remove unused utilities in the shaft, repair any damaged structures, install a water ring to control entry of water into the shaft and prevent ice from forming in winter, install a new power cable and a metal brattice between the eastern and western half of the shafts to provide a physical barrier, improving safety and functionality, company officials said.

FORBES: Hecla Officials Anticipate Clean-Up Of Mine Shaft Can Begin In Few Weeks