首先，每个耳机都采用了双重结构提供了额外的隔音层。
First, each earpiece employs a dual housing structure for an extra sound insulation layer.
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.
水泥砂浆层用于地板(达到隔音隔热的目的)，而天花板由多孔的水泥基板吸收声音。
Cement screed is used for the floor (for sound insulation and thermal mass) while the ceiling consists of perforated cement-based panels to absorb sound.
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