打埋头孔的英文：
countersink (drill)

countersink是什么意思：
vt. 钻孔装埋,打埋头孔于
n. 皿锥,埋头孔,暗钉眼

Detachable pilots for use with counterbores and countersinks
锪钻用可换导柱

Countersinks with morse taper shanks and detachable pilots
带可换导柱锥柄90°锥面锪钻90°

Countersinks with morse taper shanks for angles 60°,90°and 120°inclusive
柄锥面锪钻

drill是什么意思：
n. 钻头，钻孔机；操练，演习；条播沟
v. 钻（孔）；钻探；操练，演习；条播

The worker was drilling.
此工人在用钻孔机钻孔。

Drilling is performed with a rotating tool called a drill.
钻孔是用一个称为“钻头”的旋转刀具进行的。

Can you teach me the drill?
你能教我正确的作法吗？

drill type burner
钻孔型火口

The team is still drilling.
钻探队还在钻探。