n.凹，凹陷，凹形，凹状，凹陷处

原形：concavity复数：concavities

The curve of the parabola is concave upward.
这个抛物线的曲线向上凹陷。
The graph of the function y = x^3 has a point of inflection, indicating concave curvature.
函数y = x^3的图像有一个拐点，表明曲率是凹的。
A convex polygon has no concave angles, while a concave polygon does.
凸多边形没有凹角，而凹多边形有。
The surface of a saddle is an example of a concave shape.
马鞍的表面是一个凹面的例子。
In economics, a downward-sloping demand curve is said to be convex or relatively concave.
在经济学中，向下倾斜的需求曲线被认为相对凹的。
The curvature of a road can be described as concave if it dips inward.
如果道路向下凹陷，那么它的弯曲可以描述为凹的。
A concave lens focuses light rays more than a flat one, creating a virtual image.
凹透镜比平面镜更聚焦光线，形成虚像。
The curvature of a hyperbola is negative, making it appear concave.
双曲线的曲率为负，看起来是凹的。
A logarithmic graph exhibits concave downward behavior for positive values.
对数图对于正值表现出向下凹的特性。
The profit curve for a monopolist is typically concave, reflecting diminishing marginal returns.
垄断者的利润曲线通常是凹的，反映了边际收益递减。