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полукруглая арка stresses
gen.	round arc; semicircular arc
archit.	round arch
construct.	full-centred arch; Roman arch
el.	semi-circular arch
mining.	semi-circular arch (крепи)
tech.	semicircular arch
полукруглые арки
Makarov.	semicircular arches

полукруглая арка: 4 phrases in 4 subjects

Bridge construction	1
Construction	1
Makarov	1
Technology	1