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窄焊道
met. string er bead
oil string bead; stringer bead
tech. string beading
窄焊道〈焊条不横摆〉
plast. stringer bead
窄焊道焊条不横摆
construct. stringer bead
窄 焊 道
: 8 phrases in 3 subjects
Metallurgy3
Oil / petroleum2
Technology3