adj.凹面的，凹的
n.凹面，成凹形
v.把…弄成凹(面)

原形：concave第三人称单数：concaves复数：concaves过去式：concaved过去分词：concaved现在分词：concaving

The curve of the parabola is concave upward.
这个抛物线的曲线是向上凹的。
A person's smile can appear convex or concave, depending on how广泛他们张开嘴。
一个人的笑容可能看起来是凸的或凹的，取决于他们嘴巴张开的程度。
The surface of the bowl is concave, which helps to collect water.
碗的表面是凹的，这有助于积水。
In economics, a downward-sloping demand curve is concave.
在经济学中，向下倾斜的需求曲线是凹的。
The graph of a quadratic function is always concave up or down based on its coefficient.
二次函数的图形总是根据其系数向上或向下凹。
The lens in a camera is designed with a concave curvature to focus light.
相机镜头设计有凹曲率以聚焦光线。
A concave mirror reflects light in a way that creates an inverted image.
凹面镜以产生倒置像的方式反射光线。
The curvature of the Earth is slightly concave at the poles and convex at the equator.
地球在两极处略微向下凹，在赤道处则略微向外凸。
In geometry, a hyperbolic plane has a saddle-like shape, with both convex and concave regions.
在几何学中，双曲平面具有鞍形，既有凸的部分也有凹的部分。
A person's fingerprint pattern can be classified as either convex or concave ridges, giving unique identification characteristics.
人的指纹图案可以被分类为凸脊或凹脊，提供独特的识别特征。