为适应更新要求，建立了扩展关系模型。
To meet the needs of updating, the extended relation model is founded.
同练习3一样，卸载软件以管理磁盘空间并阻止tcsh将来的任何更新要求。
As in exercise 3, remove the software to manage disk space and prevent the need for any future updates to TCSH.
这项更新要求意味着无需进一步保护的作品将会更快速地进入公有领域。
The requirement of renewal meant that works that no longer needed copyright protection would pass more quickly into the public domain.
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