cavitation
noun [ U ] engineering, physics specialized uk/ˌkæv.ɪˈteɪ.ʃən/ us/ˌkæv.əˈteɪ.ʃən/
气蚀，空蚀;气穴现象
the forming of gas bubbles in a liquid, caused by changes in pressure
Cavitation can occur at the trailing edge of ship propellers, and in liquids subject to powerful sound waves. 气穴现象可能发生在船舶螺旋桨的尾部边缘，或是发生在液体受强大声波影响的时候。