新节点上的某些属性可以从消息树中的某个位置动态地取得其值，而不是需要在消息流编辑器中静态地设置其值。

Certain properties on new nodes can take their value dynamically from a location in the message tree, rather than requiring it to be set statically in the message Flow Editor.

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动态属性是在规则编辑器中定义的属性。

Dynamic properties are properties which are defined in the rule editor.

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