应答是相对耗费资源的，在分布式系统应尽量避免。

Acks are expensive and tend to be avoided in distributed systems wherever possible.

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系统设计为自报式和查询-应答相结合的工作体制。

System design is self - reported type combined with query - reply's working system.

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交互式语音应答(ivr)系统是呼叫中心的重要部分，控制整个业务流程。

Interactive voice Response System (IVR) is an important part of call center, it controls whole voice flow.

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