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，是制作乐器共木材可以作为乐器的共鸣音板，就是利用了木材的声振动特性及其辐射声能的能力。实木板材的频谱特性是其制作弦类乐器音板的重要基础，因此，找出不同木材频谱性能的差别，区分乐器用材和其他木材声振动性能上的差别，对于研究乐器用材意义重大。是什么意思？

Material physical and mechanical properties is an important indicator to characterize their characteristics. The elastic constants of wood, density, resonant sound of musical instruments total timber can be used as an instrument board, is the use of sound vibration characteristics of the wood and it

The mechanics of the physical material nature is the table with its characteristics of the important indicators. The elastic constants, wood density, and is a total musical wood can be used as musical instruments, sound of the chord is to use a sound vibration characteristics of wood and its radiati

Material physics mechanical properties are attribute its characteristic the important target.The lumber elastic constant, the density, are manufacture the musical instrument altogether lumber to be possible to take the musical instrument the sympathetic chord sound board, has used the lumber acousti

Characterization of physical-mechanical properties of materials are important indicators of its characteristics. Elastic constants of wood, density, making musical instruments co-resonates with wood can be used as a musical instrument sound board, is the use of sound vibration and sound radiation of

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