The small town was surrounded by rolling country.
小镇四周都是丘陵地带。
The country, with its low, rolling hills was beautiful.
这一地区山势低缓，连绵起伏，非常美丽。
This country has rolling hills.
这个国家群山起伏。
The national debts of that country are rolling up.
那个国家的国债在不断地增加。
The national debts of that country are rolling up.
那个国家的国债在不断地增加。
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