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oil film
auto. 润滑油膜
el.mach. 润滑油膜
met. 油膜
oil film: 71 phrases in 15 subjects
Automobiles15
Aviation2
Compressors2
Electric machinery9
Electronics1
General1
Metallurgy4
Oil / petroleum6
Oil processing plants1
Shipbuilding1
Space1
Steel production2
Technology22
Water resources1
Wind Energy3