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保护圈
anim.husb. protective layers; protective zone
compr. guard ring
oil backup ring; backup washer
plast. back-up ring
tech. guard circle
保护垫圈
tech. backup washer; chip shield; chip washer
保 护 圈: 38 phrases in 17 subjects
Agriculture2
Architecture1
Compressors2
Drilling1
Ecology1
Electric machinery2
Electronics2
Environment2
Genetics1
Geophysics1
Management1
Metallurgy1
Oil / petroleum2
Shipbuilding1
Technology13
Textile industry1
United Nations4

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