flat-topped curve

例句：

1. 1.The shape of the mountain is flat-topped curve, which makes it easy to climb.
   这座山的形状是平顶曲线，这使得它很容易攀登。
2. 2. The architect designed a flat-topped curve that perfectly complemented the surrounding landscape.
   这位建筑师设计了一个平顶曲线，完美地与周围的景观相得益彰。
3. 3. The flat-topped curve of the roadway allowed for efficient traffic flow.
   道路的平顶曲线使得交通流畅高效。