Most of the fishes make sound by moving their muscles and bubbling, while mankind make sound by the vibration of vocal cords, a big differences between them.
大多数鱼类都依靠运动肌肉，吐出气泡来发出声音，这与人类依靠声带振动发出声音有很大区别。
3
Influence of compressive ratio and density on sound absorbing property of foamed aluminum made by bubbling method has been studied and compared with that of Japanese sample.