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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).

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。

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A child begins in a colour tube, allowing its interest to guide it through various fields of knowledge and explore their interconnections.

色彩缤纷的设计能够引起儿童的兴趣，从而引导并激发他们对不同领域的知识和相关学科的探索。

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They ended up producing a flexible catheter tube that goes a bit of the way up the nostrils, then a guide wire is inserted into the targeted sinus. (In live patients this is done via an endoscope and fluoroscope.) A balloon catheter is advanced over the guide wire and positioned against the blocked ostium.

FORBES: Balloon Therapy

Unfortunately, that still provides no clear guide to how a clash between central government and the mayor over the future of the tube would be resolved.

ECONOMIST: The Greater London Authority