是否下载进度的某项或不应该在一些存储信息数据源(或模型)而不是在细胞(的视图)。

The information whether a download is in progress for a certain item or not should be stored in some data source (or model) and not in the cell (the view).

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在工程进度曲线的基础上，根据进度曲线所提供数据，运用灰色系统理论，建立一种进度偏差预测模型。

On the basis of the project progress curve and according to the data from it, the grey system theory is applied to establish a model for the prediction of progress deviation.

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