elliptical shaft的用法和樣例：
例句
- The mine flooding happed during construction of the air shaft in Qidong Coal Mine.
祁東煤礦風(fēng)井在建井過(guò)程中，發(fā)生鉆井井壁突水事故，井筒被淹。 - Cement injection of perforating holes in a frozen pipe is a wholly -new technology for consolidating shaft wall rock and stopping water of frozen shafts in coal mines.
凍結管射孔注漿是在對石油輸油井射孔技術(shù)和地面注漿技術(shù)進(jìn)行研究的基礎上，開(kāi)發(fā)出的一種用于煤礦凍結井筒圍巖加固和堵水的全新技術(shù)。
