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mud collar |
泥环 : 103 phrases in 13 subjects |
Agriculture | 1 |
Bridge construction | 2 |
Drilling | 17 |
Earth sciences | 3 |
Ecology | 7 |
Electronics | 2 |
Engineering geology | 2 |
Mechanics | 2 |
Nautical | 2 |
Oil / petroleum | 17 |
Shipbuilding | 1 |
Technology | 44 |
Water resources | 3 |