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трёхшарнирная арка stresses
construct.	three-pinned arch; triple-hinged arch; triple articulation arch
el.	three pinned arch
Makarov.	three-pin arch
seism.	triple hinged arch
tech.	three-hinged arch; triple-articulation arch

трёхшарнирная арка: 2 phrases in 2 subjects

Construction	1
Mining	1