It can improve gas suction effect, reduce drilling hole amount and save construction investment.
采用优化后的方法可以提高瓦斯抽放效果，减少钻孔数量从而节省施工投入。
Rescue workers are therefore drilling a hole on the north side of the mine.
因此，营救人员在矿井的北侧钻了一个洞。
Drilling is cutting a hole with a drill.
钻削就是用钻头钻一个孔。
Drilling can not continue until the fish or the junk is recovered from the hole.
在井底脏物或落鱼未清除之前，就不能继续钻进。
The machine is drilling a hole.
这台机器正在钻孔。
French engineers are drilling a hole into the ice to pump the water away.
法国工程师正在冰层上钻洞，用泵将湖水排出。
French engineers are drilling a hole into the ice to pump the water away.
法国工程师正在冰层上钻洞，用泵将湖水排出。
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