underground operation的意思|示意

The practical testing indicates that the system has an evident electricity-saving effect while ensuring a safe underground operation.

实际测试表明，在给井下安全作业带来了可靠保证的同时，节电效果明显。

Xinpu Phosphate Mine, medium and small-sized, features Complicated hydrogeological conditions and Marine sludge and heaving sand menacing underground operation.

新浦磷矿为一水文地质条件较复杂，海淤、流砂威胁井下开采的中小型矿山。

The phenomenon of reservoir permeability decrease caused by drilling, completion and other underground operation is known as formation damage.

在钻井、完井等井下作业过程中，造成油气层渗透率下降的现象通称为油气层损害。