This room is not well insulated against sound. / This room is not well soundproofed/sound-conditioned.

这间屋子隔音不好。

Proust had his apartment soundproofed.

普鲁斯特把他的公寓隔了音.

Ceiling are sometimes soundproofed, and music is piped in. Most of the stores are air-conditioned.

有的天花板装有隔音层，从里面不时的传出音乐声，大多数超市都装有空调。

Ceiling are sometimes soundproofed, and music is piped in. Most of the stores are air-conditioned .

有的天花板装有隔音层，从里面不时的传出音乐声，大多数超市都装有空调。