逻辑记录长度格式档案的一个特色就是比卡片格式档案来得节省空间。
Typically, logical record length format is more space-efficient than card image.
逻辑记录长度格式档案中每个逻辑与实体记录长度，以字节（即字段）为单位。
The length, in bytes (i. e. , columns ), of a logical and physical record in a logical record length formatted file.
所以当每笔数据或是每一分析单位被储存在一笔实体记录时这种档案结构就称为”逻辑记录长度”。
Thus, when the data for each case or unit of analysis is stored in a single physical record, the file structure is called "logical record length."
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