The concept of open source is now generally well understood in relation to software, but can it be extended in a clear-cut manner to hardware too?
大家现在都很了解软件开源思想，但是它也能清晰地扩展到硬件上吗？
The equivalence relation is the basic Concept of the rough set theory.
等价关系是粗集理论中的一个重要概念。
The text will tell how to analysis its connotation and denotation and relation with the related concept.
对如何理解这一表述、其外延如何及与相关概念关系做了分析。
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