求翻译：隔声墙由隔声模块板组合拼装而成。壳体材料为：钢质隔音模块，模块板内填充多层复合隔音材料，内层采用1.2mm镀锌钢板，2mm厚钢板做支持龙骨是什么意思？

Walls and the insulation modules assembled from a combination plate. Housing material: steel sound modules, multi-layer composite insulation panels filled with material, the inner layer of 1.2mm galvanized steel, 2mm thick steel plate to do to support keel

Walls by acoustic Module Panel assembled. Material: steel shell for noise module, module GEM filled within multi-layer compound acoustic materials used in top 1.2 mm galvanized steel, 2mm steel plate keel do support

The soundproofing wall becomes by soundproofing mold block combination assembling.The shell material is: The steel sound-insulated module, in the mold block fills the multi-layered compound sound-proof material, the inner layer uses the 1.2mm galvanization steel plate, the 2mm steel plate does suppo

Sound insulation wall formed by composite by the acoustic module Assembly. Case material: steel sound module, module Board into multi-layer insulation materials, inner layer made of 1.2mm galvanized steel sheet, 2mm do support medium and heavy plate keel

Sound insulation wall formed by composite by the acoustic module Assembly. Case material: steel sound module, module Board into multi-layer insulation materials, inner layer made of 1.2mm galvanized steel sheet, 2mm do support medium and heavy plate keel