system table的用法和样例：
例句
- The following table lists the types of allocation units used to manage data in tables and indexes.
下表列出了用于管理表和索引中的数据的分配单元类型。 - You cannot directly work with the data in the system tables.
不能直接使用系统表中的数据。 - This procedure inserts references into the system tables for any rows in a source table that are not currently included.
此过程将对源表中当前未包含的所有行的引用插入到系统表中。
