当流体力学波阵面抵达周围介质时，它像一个运动迅速的活塞。
When the hydrodynamic front reaches the ambient medium it ACTS like a fast - moving piston.
凸面阀座。阀座周围的槽将颗粒收集起来，并排挤到闸刀旁边，以避免出现堵塞。当阀门开启时，流体介质压力就会清洗槽内的颗粒。
Raised-face seat. A groove around the seat collects particles pushed aside by the knife and prevents clogging. When the valve opens, media pressure cleans the groove.
用多种物探方法进行可行性试验，确定了贝壳堤与周围介质的具体物性差异。
The feasibility tests of varied geophysical methods determined the physical character differences between the shell bank and the surrounding media.
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