The chemist Friedrich Kekulé discovered the ring-shaped structure of benzene after dreaming of a serpent devouring its tale, for example.
例如，化学家Friedrich Kekulé梦到蛇咬住自己的尾巴后得到启发，发现了苯的环状结构。
This paper describes the structure and the performance of the motorcycle engine O-shaped rubber sealing ring, and the reasons and mechanism of aging of rubber products are also elaborated.
介绍了摩托车发动机O型橡胶密封圈材料的结构、性能，阐述了橡胶老化的机理。
The structure is composed of a plurality of ring shaped portable unit toilet cushions;
其结构由若干环形一次性单元坐便垫所组成；
The structure is composed of a plurality of ring shaped portable unit toilet cushions;
其结构由若干环形一次性单元坐便垫所组成；
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