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File:Seikan Tunnel 3d cross section 1a.svg
来自维基百科,自由的百科全书
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File:Seikan Tunnel 3d cross section 1a.svg
A sketch (not to scale) of a typical
cross
section
of the
Seikan
Tunnel
, an underwater railway
tunnel
in Japan. Inspiration provided by: Morse, p52, bottom