精良的索引工具适用于特殊型态的档案、活动的本质、及实作与操作时所需的资源。
Sophisticated indexing tools are suited to particular types of records, the nature of the activity and the resources required in their implementation and operation.
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。
In files that include different units of analysis, for instance, different record types are needed to hold the different variables.
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