concave

形容词

1. 1

   凹的、凹面的

   A concave lens makes distant objects look smaller.

   凹透镜会让远处的物体看起来变小。

2. 2

   凹陷的、塌陷的

   Years of illness had left his cheeks concave.

   多年的病痛让他的双颊凹陷。