而此时，往往需要基于细胞的轮廓模型来对这些不确定边界进行轮廓拟合。

而此时，往往需要基于细胞的轮廓模型来对这些不确定边界进行轮廓拟合。

Results (English) 1:

At this time, a cell-based contour model is often needed to contour these uncertain boundaries.

Results (English) 2:

At this point, cell-based contouring models are often required to contour these uncertain boundaries.

Results (English) 3:

In this case, the contour model based on cells is often needed to fit these uncertain boundaries.