concavities

n.

凹面，成凹形( concavity的名词复数 )；

1. And there also was a concavity in his car's front wing (fender).
   而且，他的前挡板上还凹陷了好大一块撞痕。

Repairing concavities in ROC curves
Repairing Concavities in ROC Curves
Concavities as basic features in visual search: evidence from search asymmetries
Suture correction of nasal tip cartilage concavities.
Method for recognizing concavities in an image subject to character recognition
Detection of change in shape: an advantage for concavities.
Root Trunk Concavities as a Risk Factor for Regenerative Procedures of Class II Furcation Lesions in Dogs
Method of forming concavities in the surface of a metal component, and related processes and articles
Enhancing CSS-based shape retrieval for objects with shallow concavities
BINARY IMAGE SEGMENTATION OF AGGREGATES BASED ON POLYGONAL APPROXIMATION AND CLASSIFICATION OF CONCAVITIES