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水平排水 : 65 phrases in 13 subjects |
Agriculture | 2 |
Automobiles | 2 |
Business | 1 |
Ecology | 5 |
Electronics | 1 |
Engineering geology | 10 |
Hydroelectric power stations | 5 |
Management | 1 |
Oil / petroleum | 1 |
Rail transport | 1 |
Technology | 34 |
Volleyball | 1 |
Water resources | 1 |