单词：retrieval operation
retrieval operation的用法和样例：
例句
- The total number of data rows retrieved by the data retrieval operation.数据检索操作检索的数据行总数。
- A probe in a manual information retrieval operation that may be passed through holes or notches to assist in sorting or selecting cards.在手工信息检索操作中使用的一种金属针，可以穿过卡片小孔或切口，用来帮助对卡片进行排序或选择。
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