以外力地质作用、困难度指数和地表切割密度作为公路地貌二级区划的主导指标；

Based on those works, the index system of landform regionalization of highway in China was developed.

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随着机器人规模的线性增加，它的花费和难度都成指数增加。

As the size of a robot increases linearly, the cost and difficulty to make it increases exponentially.

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随着所考虑的城市数量的增加，这个难题的难度将呈指数式增加。

This is a puzzle that increases exponentially in complexity with the number of cities considered.

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