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чёрный пол stresses
gen.	false floor
construct.	naked flooring; sub floor; rough-timber boarding; drawing floor (MichaelBurov); counter floor; false floor (VLZ_58)
seism.	subflooring
tech.	subfloor; false ceiling; dead floor; rough floor; blind floor; counterfloor
wood.	counter sub-floor; sub-floor

чёрный пол: 16 phrases in 5 subjects

Architecture	1
Construction	7
General	2
Seismology	1
Technology	5