1.
unit-type drill head
组合钻床钻头, 标准钻头
2.
drill(ing) head
钻头; 主轴头; 钻床床头箱; 钻削动力头;钻头头部, 钎头
3.
part of a drill that grips the bit
夹头（钻或钻床上用以夹住钻头的部分）.
4.
a small bit that drills a first hole to guide a larger drill.
钻凿初洞来导引大钻头的一种小钻头。
5.
easing the bit in
钻头轻压慢转钻进地层
6.
A tool used for drilling.
钻头用于钻孔的工具
7.
a bit used in drilling for oil.
油田钻井使用的钻头。
8.
A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
钻头曲柄、钻柄或钻床之上用于钻孔的尖头工具
9.
eggbeater PDC bit
打蛋器型PDC钻头
10.
Drilling is cutting a hole with a drill.
钻削就是用钻头钻一个孔。
11.
Comparative analysis of drilling characteristics of dia- mond bits and roller bits
金刚石钻头与牙轮钻头钻井特点对比分析
12.
bit cutting angle
钻冠的尖度，钻头磨角，钎子头刃角
13.
A needle-shaped drill for boring holes in rock or masonry.
钻头，钻石器，钻孔器用于在岩石或砖石上钻孔的针形钻
14.
An awl with a beveled tip, used to make holes in wood for brads or screws.
锥钻，打眼钉钻头倾斜的钻子，用于在木头上钻孔以钉角钉或螺钉
15.
a thin bit a center point and cutting edges on either side.
一头是圆头、一头是切边的一种瘦钻头。
16.
a drilling bit with cutting edges usually hard-tipped against wear.
有靠着钻身的硬顶和切边的一种钻井钻头。
17.
7.12 Trip up at once, pull the bit into the casing.
立即起钻，将钻头提到套管内。
18.
Sometimes he sends his drill more than a mile into the earth.
有时他得把钻头钻入地下一英里深。