求翻译：材料的物理一力学性质是表征其特征的重要指标。木材的弹性常数、密度，是制作乐器共振板的选用指标。另外木材受机械振动表现出的特性，即声振动特性，是研究木材声学以及乐器用材选择的理论基础。木材具有弹性，在冲击力或周期性外力的作用下会产生和传播振动，振动的木材表面以空气为媒介，将振动波传入人耳。声学性能优良的木材，具有好的声共振性和振动频谱特性，能够在冲击力作用下，发出音色优美的乐音。是什么意思？

Material physical and mechanical properties is an important indicator to characterize their characteristics. The elastic constants of wood, density, is the selection of indicators to make musical instruments sounding board. Another timber by mechanical vibration performance characteristics, namely,

The mechanics of the physical material nature is the table with its characteristics of the important indicators. The elastic constants, wood density, making musical instruments is the choice of indicators panel resonance. In addition wood affected by mechanical vibration characteristics of sound vib

Material physics mechanical properties are attribute its characteristic the important target.The lumber elastic constant, the density, are manufacture the musical instrument sound board to select the target.Moreover the lumber the characteristic which is appeared the mechanical vibrometer, namely th

Characterization of physical-mechanical properties of materials are important indicators of its characteristics. Elastic constants of wood, density, selection index is to make a soundboard of the instrument. Other characteristics of the mechanical vibration of wood show, the sound vibration, is to s

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