The uncertainties come from synthetic action of input and output structure, investment of pollution control, environment policies, etc.
这种不确定性主要来自于经济的投入和产出结构、污染治理投入和环境政策等因素的综合作用结果。
In particular, you will be able to design the input and output data structure of activities.
特别的是,您将能够设计活动的输入数据和输出数据的结构。
They define the structure of the input data source and the structure of the output document.
它们定义了输出文件的结构与输入数据源的结构。
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