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桶底 : 27 phrases in 11 subjects |
Animal husbandry | 1 |
Architecture | 1 |
Drilling | 1 |
Electronics | 1 |
Fish farming pisciculture | 1 |
General | 2 |
Materials science | 1 |
Metallurgy | 6 |
Nonferrous industry | 1 |
Oil / petroleum | 1 |
Technology | 11 |