如果您可以控制服务，可以考虑向您的调用者返回一个惟一的限定符，使用一种后来向不同服务询问请求状态的方式。
If you have control over the service, consider returning a unique identifier to your callers that provides them with a way of later asking a different service method about the status of the request.
我们询问了三个经营家庭寄宿服务的家庭，让他们告诉我们他们住在哪里。
We asked three families who run homestays to tell us about where they live.
使用者向UDDI询问服务提供者列表。
The consumer asks UDDI for a list of providers for a service.
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