concave hyperbolic contour

例句：

1. 1.The curved surface of the moon is concave.
   月亮的曲面是凹的。
2. 2.The car's dashboard is concave in design.
   汽车仪表盘的设计是凹的。
3. 3. The concave shape of the rock is fascinating.
   岩石的凹形设计令人着迷。