Captured CPU time is the CPU busy time that the operating system can reliably attribute to a given address space.

捕获的 CPU 时间是操作系统能可靠地用于一个特定的地址空间的 CPU 被占时间。

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The time complexity and space complexity of the traditional attribute reduction algorithm using discernible matrix are quite big.

传统的利用区分矩阵进行属性约简算法，其时间复杂度和空间复杂度很大。

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First, the attribute of studies, theoretical research is different from applied study: the former requires data to be continuous in time and entire in space, but the latter demand the data to be new.

一是研究的属性问题，即理论研究和应用研究在资料利用方面的不同：理论研究要求数据资料的时间连续性和空间完整性，但对数据的现势性没有特别要求；

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