This is because a flow designer USES promotion to control the setting of a property value in a hierarchical composition.

这是因为流设计人员是使用升级来控制分级结构中的特性值的设置。

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You develop a flow application using nested flows, property promotion, and configurable properties.

您使用嵌套流、特性升级和可配置特性来开发流应用程序。

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The promotion feature allows the flow developer to specify that several properties are set by a single promoted property.

升级特征可以让流开发人员指定由一个升级特性来设置几个特性。

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The tourist promotion industry is gearing up to serve the growing flow of tourists from emerging economies.

BBC: Chinese tourists now biggest source of travel spending