在羽毛高尔夫球时代，仅有两种高尔夫球杆被使用，一种是带有大凹杆面的沙铁杆，另一种是杆头很小的。
Only two types of irons were used during the feathery ball era, the sand iron with a large concave face and the rut iron which had a very small head.
在工作过程中，冲头与凹模切口的半径定位，确保形成所需的圆形，而不至于在圆边产生“缺口”。
The radius of the punch and die cutting edges is laid out to produce the desired circular shape without nicking into the circle as the work proceeds.
冷镦圆头凹模是冷镦螺栓生产过程中的关键模具。
Cold upset female die of fillister head is the key mold in the manufacturing process of heading bolt.
分析齿轮摆辗凹模的失效形式，并且通过改变直齿圆锥齿轮摆辗的工艺参数的有限元模拟，探讨了凹模进给量、摩擦系数和摆头倾角的改变量对凹模应力影响以及对凹模失效形式的影响。
The failure form of rotary roll cavity die for straight tooth bevel gear was analyzed, and the finite element simulation method was employed to change the processing parameter of rotary roll.
凹槽位于螺丝头 上，嵌槽凹设于凹槽的底部中央，而凸缘位于凹槽的外周缘。
The flute is located on the screw head, and the inserting recess is located at outer circumference of the flute.
我低着头从一拨又一拨吊唁的人群中穿过。他们轻声地交谈着，不时停下来看看每堵墙上的凹室：里面的小铜门一直排到了天花板上。
I keep my head down as I walk through groups of funeral-goers, talking quietly to each other and pausing to examine the compartments lining every wall: little brass doors up to the ceiling.
切削头包括具有凹入部分(30)的伸出凸脊(28)。
The cutting head has a projecting ridge (28) with a recessed portion (30).
肌肉拉勾为曲状双头结构，其两端部的撑开器为内凹的曲面板状。
The muscle pulling hook is curved double-head structure, and the expanders for the two end parts are concave curved plates.
肌肉拉勾为曲状双头结构，其两端部的撑开器为内凹的曲面板状。
The muscle pulling hook is curved double-head structure, and the expanders for the two end parts are concave curved plates.
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