The soundproofing factory fired Mr. Wu in 1999.

隔音材料的工厂在1999年解雇了吴先生。

Soundproofing should always be installed by a certified expert.

应该由一位被证明的专家总是安装隔声。

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。

Consider soundproofing the room if necessary, or use double glazing or shutters to keep out street noise.

如果真的有需要请考虑隔音的房间，或使用加厚玻璃窗或百叶窗阻挡噪音。

Technical improvements include soundproofing and a system to better regulate the room's temperature.

房间技术性的升级体现在隔音设备和调节室温系统等。