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旋环 xuánhuán
tech.	knurled ring

旋环: 183 phrases in 41 subjects

Agriculture	10
Air defense	3
Animal husbandry	2
Architecture	1
Astronomy	1
Automobiles	12
Aviation	2
Bridge construction	5
Business	1
Chemistry	3
Compressors	2
Construction	3
Dermatology	2
Desert science	4
Drilling	4
Ecology	1
Electric machinery	2
Electronics	3
Engineering geology	1
Environment	1
General	9
Genetics	6
Gymnastics	8
Hydroelectric power stations	1
Life sciences	1
Mechanics	1
Metallurgy	7
Molecular genetics	7
Nautical	3
Oil / petroleum	4
Perfume	1
Pharmacology	4
Plastics	2
Psychology	1
Securities	1
Shipbuilding	3
Space	3
Sports	1
Technology	52
Textile industry	2
Wind Energy	3