They stacked rocks with center holes (tube or doughnut shaped) from the surface to the deepstone layer as a guide for their drills (similar to today's guide tubes).
管状或中空管状的中心孔从地表到深石岩石层放满石头,以作为铁转的探头,作用类似今天的导管。
2
Mr Kuchi, who is famed for his deep knowledge of customary law, asked the feuders to "place a stone" on their dispute-to suspend hostilities while the jirga sat.
库奇以其对习惯法的深刻认识而出名,他请求双方将争执“用坚石压下”——在支尔格期间中止彼此恶意。
3
But a researcher [Julio Mercader], from the University of Calgary, decided to survey 70 stone tools found in one of the deep chambers of a long cave.