The tickets have a time availability period, and if the host clock is not synchronized with the Kerberos server clock, the authentication fails.
票据有一个时间可用段，如果主机时钟与Kerberos服务器时钟不同步，则认证失败。
Presence server: a "Presence server" provides the services to collect, manage and distribute the real time availability and the means for communicating among users.
在线状态服务器：“在线状态服务器”提供用于收集、管理和分发实时可用性和用户间的通信方法的服务。
Replication allows real-time availability and scalability across these servers.
复制可在这些服务器间提供实时的可用性和可伸缩性。
Moreover, the new concepts of ecological optimization criterion and finite time availability are presented.
同时，还介绍了生态学优化准则及有限时间可用性等新概念。
Time-availability maps provide a listing of who is most likely to be available for a certain hour in a certain location.
时间-可用性地图提供了在特定时间特定地点最有可能取得联系的人员的清单。
Time-availability maps provide a listing of who is most likely to be available for a certain hour in a certain location.
时间-可用性地图提供了在特定时间特定地点最有可能取得联系的人员的清单。
应用推荐