战斗发生的地区丘陵起伏，树木茂密。
The areas where the fighting is taking place are hilly and densely wooded.
阿加西为了研究，访问了欧洲北部和北美的许多地方，从斯堪的纳维亚的山脉和新英格兰走到美国中西部起伏的丘陵。
For his research, Agassiz visited many places in the northern parts of Europe and North America, from the mountains of Scandinavia and New England to the rolling hills of the American Midwest.
200万年前，在树木丛生的谷地和波状丘陵地带的起伏平原之下，是洞穴密布的地下蓄水层。
Two million years ago, a cave-studded aquifer lay beneath an undulating plain of shallow, wooded valleys and rolling hills.
加上丘陵地区起伏的风向，就产生与水面泛起的波纹相同的效应。
Add wind passing over rolling terrain and "you get the same wavy effect as on the surface of water."
加上丘陵地区起伏的风向，就产生与水面泛起的波纹相同的效应。
Add wind passing over rolling terrain and "you get the same wavy effect as on the surface of water."
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