sheet cavitation
沟槽：在系统中的金属屑或外部的材料在密封的运动面轴向切断，空气气泡的膨胀(气蚀)也能引起这个现象。
Grooving: Metal chips or other foreign material in the system lead to axial cuts on the dynamic side of the seal. Expanded air bubbles (cavitation) can cause also this phenomenon.
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