Protection server (ptserver) - Maintains protection database (PDB) that maps between user or group names and their internal numerical AFS identifiers.
保护服务器(ptserver)—负责维护保护数据库(PDB)，此数据库建立了用户或组名称与其内部的数值的AFS标识符之间的映射。
In addition to numerical data, the other most popular type of data to store in a database is character data.
除了数值类型，数据库中最常用的保存数据的另一个类型是字符数据。
The statement is supported by the numerical simulation experiments on facial database of ORL.
ORL人脸数据库的数值实验，验证了上述论断的正确性。
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