机械钻孔机的英文：
mechanical drilling

类似PCB电路板行业的精密钻孔

mechanical是什么意思：
adj. 机械的，力学的；呆板的；擅长于机械原理的；客观的

Mechanic Products
机械产品学

A study of auto mechanics makes you a mechanic.
如果你学的是自动化，你会当上机械师。

margin release mechanism
极限释放机构

drilling是什么意思：
v. [drill] 的现在分词形式；钻孔，训练

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？

pcb是什么意思：
Printed Circuit Board,印刷电路板

A unique two-stage process is being used to degrade PCBs in the river's sediments.
在河水沉积物中，降解PCBs是通过2个独特的步骤进行的。

Wastes streams (e. g. = clinical wastes, waste mineral oil, PCBs, etc. )
废物流(例如:医疗废物，废矿物油，多氯联苯，等等)

"PCBs don't break down in soils, water or air, but carry on accumulating."