介绍了一种改进型雷击模型，它既兼有雷击本身的特点，又具有相对简洁的数学基础。

An improved return stroke model (du model) that is both physically oriented and has a relatively straightforward mathematical basis is introduced.

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模型采用了多目标规划的数学方法，同时兼有目标规划的特点。

The model is formulated based on the multiobjective programming, but with the characteristic of goal programming.

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