每个业务流程都处理一些易变数据，这些数据可用于支持流中的决策，或者用作某些流活动的输入或输出参数。
Every business process deals with some amount of variable data, that might be used for decisions within the flow or as input or output parameters of some flow activities.
如果在输出服务中改变数据类型，那可是个重大改变。
If you change a data type in the output service, it is a major change.
变数的调整，不断调整，使每个输出的。
A variable adjustment enables continuous adjustment of each output.
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