使用者查看服务目录确定特定场景中要调用的服务时，服务描述就非常有用。
A service description is useful when a consumer is looking at the service catalog to identify the right service to call for a particular scenario.
上月销售过一批库存产品，同样也是合同与产品目录确定后，才发现有些产品没货或存货量不对。
We selled a set of stocks last month, and we found that there were no stocks or the wrong stocks amounts for some products after also checking between sale contract and product catalogues.
您可能还记得上一篇文章中的内容，平面文件资源适配器通过轮询事件目录来确定何时添加新的文件，然后将内容转发到模块。
As you might recall from the previous article, the flat file resource adapter polled the event directory to determine when new files were added and then forwarded the contents to the module.
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