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安全环 ānquánhuán
oil guard collar; safety link
tech. guard ring; safety collar; safety ring
安全环
: 95 phrases in 28 subjects
Architecture1
Automobiles3
Aviation7
Cryptography1
Drilling3
Earth sciences1
Ecology4
Electronics9
Environment12
Explosives and Explosive Ordnance Disposal2
Finances2
Food service and catering1
General1
Genetics1
Hydroelectric power stations1
Information technology2
Logistics1
Metallurgy1
Mining1
Multimedia1
Nautical6
Oil / petroleum4
Rail transport2
Space3
Technology19
United Nations2
Water resources2
Wind Energy2

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