当远程域受到信任并且可以自己进行身份验证时，这种方法最为有效。
This technique is most effective when the remote domain is trusted and can itself be authenticated.
通过在eu和na之间添加显式的域间信任，从欧洲请求服务票证的操作仅需要两次跳转。
By adding an explicit inter-domain trust between EU and NA, service ticket requests from Europe only require two hops.
tai会扩展信任域。
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