drill hole

基本解释

"The drill hole is just a pinprick on an elephant's back, " he said.
“钻井对于整个岩浆体来说只不过是大象背上的一个小针孔。” 马施说。
Drilling: refers to the use of drilling or milling machine drill hole of the workpiece process.
钻孔：指在钻床或铣床上使用钻头对工件进行打孔的工艺过程。
www.spk-dg.com
In general can be twist drill hole, but you should drill holes, step and then expanded to the required diameter.
用一般的麻花钻即可开孔，但应先钻小孔，然后步扩大到所需直径。
www.jsd-jasper.com

What they've done before the commercial versions is using, like, five-gallon buckets of this drill hole in the bottom, so they can plant through, put some dirt in and hang it up.
NPR: Vegetable Gardening On A Budget
Either way it is particularly disappointing when you drill a dry hole such as happened to the partners in the Blueberry Hill side-track well (EXXI was not among them), which found nothing and required a write-down in the quarter, surely a factor in the price drop of the stock.
FORBES: Magazine Article