A data record whose position depends on its placement within a group of data records; its position, or record number, is its displacement, in records, from the beginning of the data set.

• 一种数据记录，其位置取决于它在一组数据记录之内的位置。它的位置或记录号是从该数据集开始位置起的位移量(以记录为单位)。