In his early 20s, he got a salaried job as salesman for a factory that made soundproofing material.
在他20出头的时候，他在一家制造隔音材料的工厂做销售员的工作。
Foaming wood-plastic composite (WPC) is not only possessing of lower density and cost than general WPC, but also better properties of soundproofing and heat insulation.
木塑复合发泡材料可以克服一般木塑复合材料诸如密度大、成本高的缺点，同时改善隔音隔热性能。
Drying equipment, muffling devices, soundproofing devices, pollution countermeasures machinery and equipment.
干燥装置，消音装置，隔音装置，对付公害的机器装置。
Drying equipment, muffling devices, soundproofing devices, pollution countermeasures machinery and equipment.
干燥装置，消音装置，隔音装置，对付公害的机器装置。
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