操作系统也提供AT来辅助有听力障碍的用户。
Operating systems also supply ATs for assisting users with hearing impairments.
如 图 10 所示，这个模式扩展了其他模式，它允许用户更新主数据集和辅助数据集，或者创建在后端系统上的持久化新记录。
This pattern, shown in figure 10, extends the other patterns by enabling a user to update primary and secondary data sets or to create new records that are persisted on back-end systems.
辅助功能有系统管理、用户权限管理、综合查询等。
The assistant functions are the system administration, the user privilege administration, overall query and so on.
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