shothole
(drilling) A hole, very deep but only a few inches wide, which is used to drop explosives beneath the Earth's surface to ease petroleum extraction.
Involving a single academic discipline
plural of Delone set
present participle of feat
掘削リグの作業員は、爆薬を発破孔に投入して埋め戻し、爆破が油を含む地層に向かうようにした。
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