In the third chapter, the concepts of loop circuit (LC) and variational geometric constraints network (VGCN) are firstly presented. Based on mate tree (MT), the generation rules of well-constrained loop circuit are presented.
第三章：首次提出了回路和变动几何约束网络概念；基于配合树研究了完全约束的回路生成方法；研究了完全约束的变动几何约束网络的判定准则。
参考来源 - 基于变动几何约束网络的形位公差设计理论与方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Based on mate tree, the generation scheme of loop circuit and 3d assembly tolerance chains is put forth.
基于配合树，给出了的回路和三维装配公差链的生成方法。
The white heron smoothed its feathers and called to its mate, sitting on their nest in a nearby tree.
这只白鹭理了理羽毛，对停在附近一棵树上的鸟巢里的同伴叫了一声。
At present, the electrical tree breaking process in the insulatic mate- rial is one of important subject of researches in the world.
电介质中的电枝击穿过程是当前国际上研究的重要课题。
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