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- 小汽车的前面有一个凹痕。
The front of the car has a dent in it.
- 凹圆形凹陷的线脚
A concave molding.
- 这辆汽车後部在碰撞中造成很大的凹陷。
The back of the car was badly dented in a collision.
- 飞檐的凹圆线脚截面近于九十度弧的凹线脚
A concave molding with a cross section that approximates a quarter circle.
- 正象双凸透镜可以放大那样，双凹透镜也可以缩小。
Just as a double convex lens enlarges, so a double concave lens reduces.
- 他的样子在凹镜里显得非常可笑。
His figure looks very funny in the concave mirror.
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