rolling
柯林斯词典
1. ADJ Rolling hills are small hills with gentle slopes that extend a long way into the distance. (山丘) 绵延起伏的[ADJ n]
...the rolling countryside of southwestern France. …法国西南部绵延起伏的乡村。
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rolling /ˈrəʊlɪŋ/
剑桥词典
rolling adjective [before noun] (GRADUAL)
gradual
逐渐的；逐步的
The plan is for a rolling extension of the tax over the next ten years . 计划是在未来十年中将这一税种的征收范围逐步扩大。
rolling adjective [before noun] (OF HILLS)
(of hills ) gently rising and falling
（山峦）平缓起伏的
The train journey took us through a valley past rolling hills . 我们乘坐火车沿一条山谷穿过绵延起伏的山峦。