Drilling further down wasn't the best solution though, because eventually the well would go below the oil and hit rock bottom.

不过，钻地更深并不是最佳的策略，因为最终钻头会钻到油层以下，撞上底部岩石。

youdao

If the "Iceland Deep Drilling Project" succeeds, it would bring the costs down even further.

如果“冰岛深钻项目(Iceland Deep Drilling Project)”获得成功，那么地热发电的成本将进一步降低。

youdao

Drilling down further into individual classes, you can see exactly which lines aren't being tested.

进一步深入到单独的类中，具体查看哪一行代码没有测试到。

youdao

So, drilling down further into the physiology of the brain, Mr. Dunbar's team has now found that a rich social network also goes with the ability to reason about others' intentional states.

WSJ: The Social Network and the Dunbar Number | Mind & Matter