| |||
grease spatter | |||
traces of oil | |||
oil trace; grease mark | |||
lubricant bloom | |||
grease marks; oil stain; oil wake | |||
oily gout; oily stain |
油 迹 : 12 phrases in 7 subjects |
Aerohydrodynamics | 1 |
Chemistry | 2 |
Earth sciences | 2 |
Geology | 2 |
Polygraphy | 1 |
Technology | 3 |
Water resources | 1 |