名词 countersink:

1. a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface

2. a bit for enlarging the upper part of a hole

countersean.逆浪countern.柜台；筹码；计数器；反驳adj.相反的adv.与…相反地v.反对；反击counter-questionv.反问counteritelligencen.反情报counterflow cooler逆流式冷却机counter deterrence反威慑counterdemonstratev.反示威counter for petrol加汽油泵的计量器counter-pilastern.对立壁柱counterflow mixing逆流式拌和counter shaft gear副轴齿轮countersunk-headn.暗钉头

oval countersunk screw椭圆埋头螺钉

countersunk hole埋头螺孔

countersunk screw埋头螺丝,埋头螺钉

countersunk head埋头钉

countersunk lug block平头带耳块

countersunk head rivet埋头铆钉

countersunk seat沉头座

countersunk spigot锥形轴颈,埋头轴颈

countersunk bolt埋头螺栓

countersunk nut埋头螺帽

countersunk rivet沉头螺钉,埋头铆钉

countersunk head screw埋头螺钉

countersunk head bolt埋头螺栓

countersunk washer埋头垫圈

countersunk collar埋头轴环