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单词 pilot tunnel
释义

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pilot 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.
extracted from pilotn.adj.
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更新时间:2024/12/24 1:17:51