The three-dimensional frame of reference is the realm of definitions, and that is why it is apparently constituted of time and space.

三度空间的思想架构是一个靠定义而存在的世界，因此，它需要时间和空间。

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Meanwhile, as a cultural space, Folk not only build up a new object for cultural animadversion but also provide another frame of reference when intellectuals pursue value.

“民间”这一博大庞杂的文化空间的引进，为知识分子的反思和社会批判确立了又一个客体，更也为知识分子的价值追寻提供了另一种参照。

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Space vector is a very important conception in electrical machine analysis. This paper discusses the reference frame conversion used in high performance motor control based on space vector.

介绍了空间矢量这一在电机分析中重要概念，在此基础上讨论了高性能电机控制中所需的各种坐标变换。

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