名词
中文翻译：Unknown
同义词：
['hilly', 'hilly area', 'hilly country']
例句：
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1. Thehilliness of the landscape makes it a popular hiking destination.
这片风景的多山特点使它成为徒步旅行的热门目的地。
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2.The hilliness of the terrain made it difficult for the soldiers to advance.
地形的多山特点使得士兵们难以前进。
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3.The hilliness of the region is due to its geological formations.
该地区的多山特点是由于其地质构造形成的。