目前使用的屏蔽数据通信电缆通常为单层或双层铜丝编织结构，生产效率低，成本高。

At present, the shielded category cables use single or double copper braid as shield, which features low productivity and high costs.

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它采用四极枪结构，两个栅极，第一栅极采用双层同心球面网，第二栅极外还添加了屏蔽筒。

The first grate has double spherical nets with the same center and outside the second one there is a shield cylinder to make electron congregate.

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提出用吸波材料与金属材料双层复合代替单层金属材料对军用电子仪器进行屏蔽的设计。

A design for screening military electronic machines using dual-layer composite of attenuating materials and metals instead of single metallic layer is proposed in this paper.

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