How does one give a finite description of a language if it contains infinitely many possible strings?

如何给一个语言一个有限的描述，如果该语言包含了无限多可能的字串？

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In the first section, namely 3.1, we obtained some description of the structure of some finite groups whose centralizers or normalizers of Abelian subgroups satisfy some conditions.

在第一部分3.1中，给出了若干由交换子群的中心化子或正规化子满足的条件所确定的有限群的结构描述。

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A design method by usage of finite state machine and VHDL hardware description language to develop the program is adopted, then it is simulated and downloaded on the EDA software platform.

采用有限状态机设计方法，使用VHDL硬件描述语言编程，并在EDA工具软件平台上进行了仿真和下载。

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