会话还提供一种跟踪匿名用户或那些在漫游站点之前不必首先登录的用户的方法。
Sessions also provide a way to track anonymous users, or those who aren't required to log in first before roaming through a site.
两位太阳能漫游者，勇气号与机遇号，自从2004年在火星登录，本来计划执行一项为时90天的任务。
Spirit and Opportunity, two solar-powered rovers that landed on Mars in 2004, were built for a mission intended to last 90 days.
该模型采用基于角色的访问控制策略，实现了各业务系统间的一次登录、统一认证、统一权限管理和业务漫游功能。
And, it implements single sign-on, uniform authentication, uniform authorization management and business systems roam between different application systems.
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