求翻译：Some people ask me whether they should construct a Faraday Cage in the bedroom in which you can sleep. Typical proposals consist of a copper sheeting all round the walls and ceiling which is very expensive, or a metallic coated material used as a cover for the bed. The latter is a more sensible and less costly option. I have developed such a material and in the course of doing so discovered that not many conventional metal threaded materials were any good. The windows can be protected by this sort of metallic mesh, which thereby still admits light and air.是什么意思？

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