What are the sources of data, units of analysis, and temporal dimensions of the research.

数据来源、析单元、及暂时研究面向为何？

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A Hierarchical file can be stored in a rectangular file structure by storing all units of analysis in a single physical record.

而一个层级式档案可以用长方形档案结构储存，亦即所有的分析单位都存到单一笔的实体记录中。

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In files that include different units of analysis, for instance, different record types are needed to hold the different variables.

举例来说，在包含不同分析单位的档案中，为了掌握不同的变项，使用不同的记录型态是必要的。

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Occasionally, you'll find you need to cancel out units, because, of course, you're always doing unit analysis as you solve your problems, and sometimes you'll need to convert joules to kilogram meters square per second squared.

偶然地，你会发现需要消除单位，因为在解题时,经常要做单位分析，所以有时候需要把,焦耳换做,一千克乘以米的平方除以秒的平方。

麻省理工公开课 - 化学原理课程节选

We divide that by the mass, so 0.12 kilograms, that's the mass of a regulation baseball for the major leagues, and the velocity of the baseball is 42 meters per second. So, we can cross out our units doing our unit analysis.

我们用质量来除它，质量为0，12千克，这是大多数联赛规定的棒球质量,棒球的速度为42米每秒,所以，我们可以消去单位,来做单位分析。

麻省理工公开课 - 化学原理课程节选

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