The inner surface of the hand that extends from the wrist to the base of the fingers.
手掌人的手指基部与腕部之间稍凹部分
(classical architecture) a molding for a cornice; in profile it is partly concave and partly convex.
（古典建筑）为一个檐板塑造；外形部分凹部分凸。
notch-tow barge
凹尾驳(尾部有顶推凹口
a sag in the seat of the chair
椅子座位部分的凹陷.
A split or indentation between two parts, as of the chin.
开裂，凹陷两部分间（如下巴）的裂隙或凹口
An opening or recess in a wall.
壁凹；墙洞墙上向内凹或向外凸的部分或孔隙
Techniques and Applied Studying of Reservoir Prediction in Biyang Middle Depression;
泌阳凹陷中部深凹区储层预测技术研究
Joining Convex (Outer) Curves to Concave (Inner) Curves
缝合凸出的弯曲部位和凹曲部位
A protruding or receding part in a surface or line.
凸出（或凹入）部分在一个表面或线条上凸出或凹入的部分
A ceiling constructed with recessed panels.
花格平顶由凹形窗格建成的顶部
a polyhedron some of whose plane sections are concave polygons.
有些平面部分是凹型多边形的多面体。
Pits on either side of the mouth may have been sense organs.
口部两侧的凹陷可能具有感觉器官。
an open recess in a wall at the base of a chimney where a fire can be built.
火燃烧的烟囱根部墙上的凹室。
The depression between the raised lines of a typeface.
字谷铅字笔划间的凹陷部分
a box pleat reversed so that the fullness is turned inward.
箱状褶翻转导致凸的部分向里凹进去。
The structure and composition of work area of blanking lower die were discussed in this paper.
讨论了冲裁凹模工作部分的结构组成。
Study on Corner Sink and Vertical Cracks of CC Steel Billet
连铸坯角部凹陷及纵向裂纹的研究
LEDGE SEATED IN BRAKESHOE NOTCH
突出部放进刹车蹄片凹口