Defines the interface implemented by the workflow expression evaluation component that provides a context frame for expression evaluation.
定义接口，该接口由为表达式计算提供上下文帧的工作流表达式计算组件实现。
Defines the interface implemented by the workflow expression evaluation component that provides a context frame for expression evaluation.
定义接口，该接口由为表达式计算提供上下文帧的工作流表达式计算组件实现。
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