Shielding usually implies the use of a metallic enclosure to prevent electrostatic interference from affecting a high impedance circuit.
屏蔽通常意味着使用金属的闭合物来避免静电干扰影响高阻抗电路。
2
Waste Printed Circuit Boards (PCBs) are worthy very much to recycle, because the metallic grade is more hundred times than the nature mineral resources.
废弃电路板中蕴含的金属是天然矿藏品位的几十倍甚至几百倍，具有重要的回收价值。
3
The outer copper or metallic braid in coaxial cable comprises half the electric circuit.