mine shaft depth 井筒深度
shaft depth measurement 竖井深度测量
depth shaft 深立井
critical depth of shaft lining 井壁极限深度
·2,447,543篇论文数据，部分数据来源于NoteExpress
According to Golborne, the first stage of drilling on Plan B has reached a depth of 1, 640 feet (500 meters) and will pierce the ceiling of the mine shaft where the men are trapped this weekend.
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