High moulded ceilings were stripped of Sixties acoustic tiles, but not of the same era's fluorescent tube lights. Simultaneously, the place felt grand and drab.
高耸的屋顶上六十年代的隔音瓦被拆除了，但是相同年代的荧光管还保留着，站厅显得空旷而无趣。
2
A standing wave tube measurement system is presented for measuring low frequency acoustic properties of underwater acoustic materials.
介绍一种用于水声材料低频声性能测量的驻波管测试系统。
3
The theoretical method for calculating the absorption coefficient of the absorber is provided by analogying the acoustic field in a tube with varying cross section.