roll camber

例句：

1. 1.The car rolled down the hillside.
   汽车沿着山坡滚了下去。
2. 2. The river curves around a large island.
   这条河绕过一个大岛。
3. 3.The bridge is designed to curve around the city center.
   这座桥的设计是为了绕市中心弯曲。