Milling operations are operations i

Milling operations are operations in which the cutting tool rotates to bring cutting edges to bear against the work-piece. 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 work-piece. Drilling operations are done primarily in drill presses but not uncommonly on the lathes or mills.

結果 (中文) 1:

铣削操作是刀具旋转，使切削刃对工件施加的操作。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。主要是在钻压而不是寻常的车床或厂进行钻井作业。

結果 (中文) 2:

铣削操作是在该切削工具旋转，使切削刃靠在工件的操作。铣床是在研磨中使用的主要机床。
钻井操作是其中空穴产生或通过使旋转刀具与下肢切削刃与工件接触精制操作。钻井作业主要是做在钻床但对车床或钢厂并不少见。

結果 (中文) 3:

铣削操作中，刀具切削刃的旋转带来的打击工件。铣床是铣削加工中使用的主要机床。钻井作业中，孔产生或通过旋转刀在下肢与工件接触的切削刃精操作。钻井作业在钻床主要是很少在车床或米尔斯。