非平行的齿轮，非交叉传动的轴也有节点，但不存在纯滚动节圆的概念。

Gears on nonparallel, non-intersecting shafts also have pitch circles, but the rolling-pitch-circle concept is not valid.

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时间的齿轮从未停止转动，它用一种最冷酷和理智的方式，让每个生命得以平行前进。

Time gears never stop turning, it USES one of the most ruthless and rational way, so that each parallel life to move forward.

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利用平行四边形连杆和齿轮的组合设计了一种外骨骼机构。

A new type of exoskeleton mechanism has been developed by combination of parallelogram link and gear.

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