在以太网络环境里，复杂的规则制约了集线器的拓扑结构和使用范围。考虑到如今应该没人再对如何使用集线器搭建一个规模巨大的以太网感兴趣了，具体细节姑且不表。
Complex rules limit the topology and the use of hubs in Ethernet networks, but I'll skip those as I doubt anyone still has interest in building a large scale Ethernet network using repeater hubs.
此方法的优点是访问后端的频率较低，并且不必反复分析样式表。
The benefits of this method are that the back end is accessed less frequently and that style sheets are not parsed repeatedly.
基本上，DB 2处理与表空间关联的所有存储管理任务——完全联机并且不需要人工干预。
Basically, DB2 handles all of the storage management tasks associated with the table space - completely online and without the need for manual intervention.
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