Each of the services groupings engages a subject area.
其中每个服务分组负责某个主题领域。
Not all services are subject to load-balancing though, the following sections will have more on this.
但是，并非所有服务都适用负载平衡，下面几节将进一步介绍。
Patrons rarely (if ever) see us, yet we touch so many of them directly though records, indexes, subject headings, and other services.
读者很少能看到我们(我是说如果他们能看到我们的话)，但是我们通过记录、索引、主题词和其他服务接触到许多读者。
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