значний успіх (значне просування)
breakthrough
achieve a breakthrough
achieving breakthrough / headway
armored breakthrough
thwart a breakthrough attempt
atomic breakthrough
hold advance / hold (up) advance
area of military significant fallout
genetically significant dosage
maintenance significant item
mean time between significant failures
militarily significant fallout
militarily significant quantity
militarily significant state
military significant fallout
no significant change
safety significant operations
significant aggravation
significant characteristics
significant concession
significant counterintelligence brief
significant damage
significant data selection
significant developments
significant divergences
significant efforts / endeavors
significant gains
significant impact / influence
significant meteorological information
significant military presence
significant structural inspection
significant track