声音是由物体振动振动产生的.一切正在�声的物体都在振动振动停止�声也停止但声音不一定消失.声音的传播是需要介质介质的所有的气体液体和 Template




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tomski声音是由物体振动振动产生的.一切正在�声的物体都在振动振动停止�声也停止但声音不一定消失.声音的传播是需要介质介质的所有的气体液体和 coloring