需要做的只是维护流程和数据之间的引用，并通过维护状态组合业务流程。

All that is required is to keep references between the process and data, and to maintain the status to orchestrate the business process.

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也就是说，服务维护其自身的状态。

That is, the service maintains its own state.

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在线测试的代码需要维护它各个变量的状态。

The online quiz script needs to maintain state of its variables.

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