鸟嘌呤：嘌呤类的有机化合物，常称为碱基，包含二个环，各含氮原子和碳原子，还有一个氨群。
Guanine: organic compound of the purine family often called a base consisting of two rings each containing both nitrogen and carbon atoms and an amino group.
示指、中指和环指是最常累及的手指，而拇指常完全不受累。
The index, middle, and ring finger are the most frequently involved digits, while the thumb is often spared entirely.
五环的回转轴承直径几米切成段常为便于运输和安装。
The rings of slewing bearings with a diameter of several metres are frequently cut into segments for ease of transport or installation.
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