Due to local terrain factors such as slope, aspect and terrain inter-shielding, the insolation duration over rugged terrain is different from over horizontal surface.

由于坡度、坡向和地形之间相互遮蔽等局地地形因子的影响，实际起伏地形下的日照时间与水平面上的日照时间有一定差异。

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And through the years , from time to time, I had walked over this rugged mountain slope and there was never a path on it until my father had made this one.

记不清有多少次了，我奔走在这崎岖的山坡坡上，那时根本就没有路，直到后来父亲修了这条小路。

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In Slope County, in south-western North Dakota, amid the vast and rugged Badlands, cattle ranchers face a similar collection of troubles.

ECONOMIST: Can the rules be bent just enough to keep them alive?