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平均粒度
archit.	grain fineness number
desert.	mean particle; mean size (指算术平均粒径)
met.	average grading; average particle size; mean particle diameter; mean particle size; particle-size average
oil	mean grain size
plast.	average particle size
tech.	average grain size

平均粒度: 17 phrases in 7 subjects

Explosives and Explosive Ordnance Disposal	4
Geology	1
Metallurgy	3
Plastics	1
Shipbuilding	1
Space	1
Technology	6