In this paper, we study the condition which makes the fundamental group of graph have every positive integer as the index of some normal subgroup.
本文主要研究图的基本群的正规子群的指数何时成为任意正整数的条件。
Here's an example: unorganized data, such as a group of measurements, is usually processed in some manner to make it easily readable for users, such as a graph or a chart.
下面是一个示例：未经组织的数据(如一组测定数据)通常采用某种方式进行处理，以便用户能方便地阅读，如处理为图形或图表。
As depicted in the Figure 3 (the overview activity graph), the next challenge will be to replicate the group assignments of the users.
如图3(概览活动图)所示，接下来面临的挑战是复制用户组。
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