然而，即使对于本原群，其次轨道的决定也是一个非常困难的问题，它依赖与人们对抽象群本身结构的了解和一些组合方法的应用。

However, such a problem is very difficult in general, even for primitive groups and it depends heavily on the understanding of abstract groups and the application of combinatorial tools as well.

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另外，也研究了富足半群的本原元。

In addition, we also consider primitive elements of abundant semigroups.

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认为造成这两大派别学术分歧的根本原因之一是攻、补两派医家所诊治患者群的不同。

The author believes that the main reason for the divergence of the two schools lies in the different patient groups they treated.

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