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。
They stacked rocks with center holes (tube or doughnut shaped) from the surface to the deep stone layer as a guide for their drills (similar to today's guide tubes).
一种导管导向机构10包括限定通道14的管状部件12。
A catheter steering mechanism 10 includes a tubular member 12 defining a passage 14.
实现上述方法的工具，设有管状成型模具，还设有管材原料芯轴、导管芯轴和成型模具芯轴。
The tool for realizing the method is provided with a tubular forming mould, a tube raw material mandrel, a catheter mandrel and a forming mould mandrel.
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