第三，你必须删除所有可能存在的你为用户提供的操作上的约束。
Third, you have to remove all possible constraints on the operations that you provide for the user.
用户可以选择任意数量的记录并在一个操作中全部删除。
A user can select any number of records and delete an operation.
只需要少许单击操作，管理员便可以创建和删除用户和组、修改组成员以及更改用户密码。
With only a few clicks, administrators can create and delete users and groups, modify group memberships, and change user passwords.
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