 |
| |||
| 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 |