单词 | pilot tunnel |
释义 | > as lemmaspilot tunnel pilot tunnel n. a small tunnel or section of tunnelling used to guide the excavation of a main tunnel. ΘΚΠ society > occupation and work > equipment > earth-moving and excavating equipment > [noun] > tunnelling equipment poling board1837 shield1837 packing-board1850 pilot tunnel1881 subterrene1956 mole1960 1881 Manufacturer & Builder Nov. 256/3 The plan of pushing a small pilot tunnel in advance of the work at the headings..is to be commended. 1958 Engineering 18 Apr. 502/1 Short pilot tunnels were driven out from the shore on both sides of the Channel. 2002 New Scientist 6 Apr. 13/1 The pilot tunnel they were boring through solid granite suddenly ran into a kind of sand called sugar-grain dolomite. < as lemmas |
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