n. concavity
misc. camber concave ; concave surface ; rearward face
齿轮及齿轮加工设备的相关词汇 ... compressie stress 压应力 concae side 凹面 concentricity 同心度 ...
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由于凹面与凸面之间没有磨损，螺母可以重复使用。
Because there is no abrasion between the concave and convex, the nut is reusable.
当上螺母的凹面与之锁紧时，其效果与用一个锤子敲进一楔子的效果完全相同。
When the concave upper nut is tightened, the effect produced is exactly the same as that produced by a hammer driving in a wedge.
凹面镜如果是从圆球上切下来的，圆球的直径会是凹面镜焦距的四倍。
The diameter of a sphere is four times the focal length of a concave mirror cut from it.
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