hills

例句：

1. 1. The sun sets over the rolling hills.
   太阳在起伏的山丘上落下。
2. 2. The children played on the hills after school.
   孩子们放学后在山上玩耍。
3. 3. The hills are covered in a thick layer of snow.
   这些山丘覆盖着厚厚的雪层。