Recessed marking

An indented or concave surface or area.

凹陷，洼地凹的表面或地区

A slight depression or indentation in a surface.

凹痕表面上轻微的下陷或凹陷

having long narrow shallow depressions (as grooves or wrinkles) in the surface.

在表面有长而狭窄且浅的凹陷的（像凹槽或皱纹）。

Concavity based in volume (concavity,v) and concavity based on surface (concavity,s), two new concepts to describe the concave degree of 3-D particles were put forward.

本文提出了体凹度和表凹度两个衡量三维粒子凹面程度的新参数；

Convex on one side and concave on the other.

凸凹的一面凸一面凹的

Curved like the inner surface of a sphere.

凹的象球体的内表面一样弯曲的

) The inside surface of the ring fits in the groove on the piston.

)些环的内表面和活塞上的凹槽相配合。

a slight depression in the smoothness of a surface.

表面光滑处的轻微的凹陷。

Judgment on Concave or Convex Lines on the Surface of Examined Workpiece;

被检工件表面的纹路是凹或凸的判定

The relationship between crater and temperature distribution on the surface hasbeen obtained.

得到了表面凹陷与表面温度分布的关系。

To form a small depression in(a surface).

在(某物体表面)留下轻微的凹痕

An outline or indentation left by a foot on a surface.

脚印脚在表面上留下的轮廓或凹痕

the formation of small pits in a surface as a consequence of corrosion.

由于腐蚀在表面形成很多凹痕的过程。

The state of being curved like the inner surface of a sphere.

凹陷被刻成象球体内表面的样子

The Effects of Surface Dent Depth on the Micro Elastohydrodynamic Lubrication

凹坑深度对表面动态弹流润滑的影响

A depression similar to that in a shallow concave container for food.

凹形，凹面与浅的凹型盛食物的容器相似的凹处

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

Drag Reduction by Dimples on Surfaces in Plane-plane Contact Lubrication

凹坑表面形貌在面接触润滑状态下的减阻研究