sludge : 237 phrases in 16 subjects |
Agriculture | 8 |
Chemistry | 2 |
Construction | 1 |
Earth sciences | 8 |
Economics | 1 |
Electronics | 1 |
Energy industry | 8 |
Environment | 171 |
General | 3 |
Industry | 7 |
Life sciences | 9 |
Mechanic engineering | 1 |
Medical | 3 |
Metallurgy | 11 |
Natural sciences | 1 |
Oil / petroleum | 2 |