The term is also used in gravel packing to describe the act of placing all the sand or gravel in the annulus.
该术语同样用于砾石充填，去描述在环空内充填沙子或砾石。
The dynamic stress inside green sand during experimental compaction by air impact moulding can be achieved using a method of placing aluminium plate at the top of green sand.
采用气冲造型机并在型砂顶部覆盖铝板的方法，获得了气力冲击造型试验紧实过程中型砂内部的动态应力。
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