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无灰
desert.	dustlessness
无灰基
oil.proc.	ash free basis

无 灰: 109 phrases in 20 subjects

Agriculture	4
Architecture	7
Automobiles	2
Biology	2
Chemistry	2
Desert science	3
Earth sciences	9
Ecology	1
Electronics	1
Engineering geology	2
General	3
Geology	1
Hydroelectric power stations	1
Metallurgy	10
Nursing	1
Oil / petroleum	8
Oil processing plants	2
Polymers	2
Pulp and paper industry	1
Technology	47