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人口管 : 28 phrases in 14 subjects |
Architecture | 2 |
Chemistry | 4 |
China | 1 |
Electronics | 3 |
General | 2 |
Hydraulics | 1 |
Metallurgy | 4 |
Otorhinolaryngology | 2 |
Polymers | 1 |
Refrigeration | 1 |
Shipbuilding | 1 |
Space | 1 |
Technology | 4 |
United Nations | 1 |