对于物理记录的处理：层次数据库中所存储的记录是由应用程序来直接操纵的。
Deals with physical records: The records stored in hierarchical databases are manipulated directly by an application.
对于物理记录的处理：层次数据库中所存储的记录是由应用程序来直接操纵的。
Deals with physical records: The records stored in hierarchical databases are manipulated directly by an application.
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