The energy loss of the gliding irrotational wave pair is made up by the longitudinal wave beam.
滑行集散波由于激发泥浆纵波而受到的损耗，要由纵波声束给以补充。
The longitudinal wave cannot exist near the surface of a solid, and those exist near it are gliding irrotational waves.
纵波不能在固体表面存在，在固体表面存在的是相应的滑行集散波。
Yet the advancing longitudinal wave beam expands continuously towards the surface, and produces new gliding irrotational waves with it.
但前进中的纵波声束不断向表面扩散而产生出新生的滑行集散波。
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