Milling operations are operations i

Milling operations are operations in which the cutting tool rotates to bring cutting edges to bear against the workpiece. Milling machines are the principal machine tool used in milling.
Drilling operations are operations in which holes are produced or refined by bringing a rotating cutter with cutting edges at the lower extremity into contact with the workpiece. Drilling operations are done primarily in drill presses but sometimes on lathes or mills.

結果 (中文) 1:

铣削操作是刀具旋转，使切削刃来承担对工件的操作。铣床的铣削加工中使用的主要机器工具。钻井作业是产生或精制而带来一个旋转刀具切削刃与工件接触下肢成孔的操作。主要在钻床，但有时在车床或轧机上进行钻井作业。

結果 (中文) 3:

铣削操作是切削刀具旋转使切削刃对工件产生的切削刃的操作。铣床是铣削加工中使用的主要机床。钻井作业是通过将一个在下肢的切削刃的旋转刀具与工件接触而产生或精制的操作。钻井作业主要是在钻床上，但有时在车床或米尔斯。