The expandedair sac presents a microspheric squash shape, and the surface is provided with slots which are arranged in order.
膨胀后的气囊呈球型南瓜状,表面有规则排列的沟槽。
2
Grooving: Metal chips or other foreign material in the system lead to axial cuts on the dynamic side of the seal. Expandedair bubbles (cavitation) can cause also this phenomenon.
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。
3
Because great numbers of people go there, the islanders have built elaborate resorts, developed harbors and airfields, improved the beaches and have expanded sea and air routes.