Digging是什么意思

用法例句

Development and application of new surface jar;

一种新型地面震击器的开发与应用

The common surface jar cannot realize the normal resetting due to small hook weight in the shallow well below 3000 m.

针对某些3000m以内的浅井,因大钩悬重小,采用常规地面震击器无法实现正常复位的问题,研制了一种新型地面震击器。