On the other hand, many think it's the basic physical properties of sound that hold the key to perceiving sounds as appealing or jarring.
另一方面，许多人认为声音的基本的物理属性，是决定听者感知为和谐或不和谐的关键。
2
Adding a back lining at one side of the porous metal material is an effective and workable way to improve its sound absorption properties.
而在多孔金属材料一侧添加背衬是一种提高吸声性能的有效可行的方法。
3
This paper derives the best range of thickness of the materials by analyzing the main factors influencing the sound absorption properties of porous metal materials.