acoustical properties meaning in English

声性能

Recommendations for the presentation of plastics design data - other properties - acoustical properties mechanical damping capacity
塑料设计数据表示方法推荐标准.第5部分:其它特性.第4节:声学特性
It was such a curious comer in its acoustical properties , such a peculiar ear of a place , that as mr . lorry stood at the open window , looking for the father and daughter whose steps he heard , he fancied they would never approach . not only would the echoes die away , as though the steps had gone ; but , echoes of other steps that never came would be heard in their stead , and would die away for good when they seemed close at hand
罗瑞先生站在敞开的窗前寻找已有脚步声传来的父女俩时，简直以为他们再也不会到达了-不但他俩的脚步声仿佛逐渐远去，而且有并不存在的别人的脚步声取而代之，而后者也并不走近，只在仿佛逼近时又消失了。