三元环包含在较大的环系统中，像三萜类中。
Cyclopropane rings are included within larger systems, such as triterpenes.
结果表明，该重排反应经过一个三元环过渡态。
The result shows that the transition state of the rearrangement reaction has a three-membered ring structure.
结果发现，该重排反应经过一个面外三元环过渡态。
The result shows that the transition state of the rearrangement reaction is a three-member ring structure external the molecular plane.
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