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низкосортный уголь stresses
gen.	grizzle; rash
ecol.	low-rank coal
el.	low-quality coal
energ.ind.	low grade coal
gas.proc.	low rank coal (сырьё для газификации)
geol.	drossy coal; fault coal
met.	inferior coal
mining.	dross-coal
railw.	brown coal
slang	real estate
tech.	immature coal; low-grade coal; lower-grade coal
therm.eng.	dant; grizzly; poor-grade coal

низкосортный уголь: 7 phrases in 5 subjects

Geology	2
Makarov	2
Mechanic engineering	1
Metallurgy	1
Mining	1