Each service exposes function and data to the service consumers, and, in doing so, it must meet agreed service levels including data accuracy, response times, and the like.
每个服务都将功能和数据公布给服务消费者，与此同时，它必须满足约定的服务级别，包括数据精确性、响应时间等。
Feed aggregator is a wrapper component that wraps the feed reader component to meet the main objective of this article: to create a customizable RSS feed aggregation function.
提要聚合器是一个包装器组件，用来包装提要阅读器组件以实现本文的主要目标：创建一个可定制的rss提要聚合函数。
The EXTRACT function is designed for situations where the results set expects to find multiple objects that meet the selection criteria.
EXTRACT 函数用于生成包含满足选择条件的多个对象的结果集。
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