Synchronous and asynchronous notification provides the flexibility required for all but the most esoteric situations.

而同步和异步通知则为不同的解决方法提供了非常大的弹性。

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For example, scheduling a procedure or a test for a patient and requesting asynchronous notification of such events as availability of test results.

例如，为患者安排手续或检查，并请求检查结果的有效性等事件的异步通知。

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In this way, even without polling, the client is always in a state waiting for a response from the Web service, which simulates an asynchronous notification.

这样，即使不轮询，客户机也始终处于等待模拟异步通知的Web服务响应的状态。

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