深入地研究了单环路封闭式行星齿轮传动系统的动态特性；
The dynamic behaviors of encased differential gear train had been systematically re- searched.
并在理论分析的基础之上，提出了单环路行星传动系统的设计准则，为单环路行星传动系统的设计开发提供了理论依据。
Based on theoretical analysis, has proposed the single-loop planetary transmission system's design criteria and for the single-loop design planetary transmission system provides the theory basis.
单连通和非单连通的概念，研究哪些环路能界定曲面，可以用来对空间内部物体的形状进行分类。
This concept of being simply connected or not, and studying which loops bound surfaces or not can be used to classify shapes of things inside space.
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