While the Subject represents security operations for the current user, the SecurityManager manages security operations for all users.
Subject代表了当前用户的安全操作，SecurityManager则管理所有用户的安全操作。
In recursive mode, it notices which groups contain other groups and lets you perform recursive operations, such as removing a user from the current group and all subgroups.
在递归模式下，它将查看哪些组包含其他组并允许执行递归操作，比如从当前组及其所有子组中删除用户。
In recursive mode, it notices which groups contain other groups and lets you perform recursive operations, such as removing a user from the current group and all subgroups.
在递归模式下，它将查看哪些组包含其他组并允许执行递归操作，比如从当前组及其所有子组中删除用户。
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