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ray pattern
nautic.	声径图

ray pattern : 32 phrases in 16 subjects

Agriculture	1
Chemistry	4
Clothing	3
Earth sciences	2
Electronics	1
Engineering geology	1
Explosives and Explosive Ordnance Disposal	2
Leather	1
Life sciences	1
Metallurgy	9
Mining	1
Plastics	2
Polymers	1
Reproductive biology	1
Steel production	1
Technology	1