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烟灰 yānhuī
agric.	soot (fuligo)
ecol.	fly ash
met.	flyash
plast.	quick ash
tech.	grime; fly-ash
textile	ash; smoky grey; vapour blue
wind.	smoke and soot; soot
烟囱灰
coal.	flue dust.
plast.	airborne dust
tech.	flue dust
烟道灰
plast.	light ashes
tech.	flue dust
烟〔粉煤〕灰
gen.	flyash

烟灰: 120 phrases in 17 subjects

Agriculture	3
Architecture	1
Automobiles	19
Aviation	2
Biology	1
Chemistry	2
Ecology	3
Explosives and Explosive Ordnance Disposal	1
General	16
Metallurgy	12
Nautical	3
Oil / petroleum	3
Shipbuilding	1
Technology	42
Textile industry	8
Ventilation	1
Wind Energy	2