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массивно-контрфорсная плотина stresses
construct.	massive head buttress dam
el.	head buttress dam; massive head dam; round-head type buttress dam
tech.	roundhead buttress dam; hollow gravity dam; deckless buttress dam
массивная контрфорсная плотина
construct.	box dam
el.	massive buttress dam

массивно-контрфорсная плотина: 3 phrases in 2 subjects

Construction	2
Technology	1