curved saw

例句：

1. 1.The car was designed with a curved roof for better aerodynamics.
   这辆车的设计有一个弯曲的屋顶，以获得更好的空气动力学性能。
2. 2. The river flows through a curved valley.
   这条河穿过一个弯曲的山谷。
3. 3. The artist drew a curved line to create the illusion of depth.
   这位艺术家画了一条曲线来创造深度的错觉。