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成环形 : 27 phrases in 14 subjects |
Agriculture | 2 |
Air defense | 1 |
Earth sciences | 1 |
Ecology | 1 |
General | 2 |
Geophysics | 2 |
Gymnastics | 1 |
Metallurgy | 1 |
Nursing | 2 |
Plastics | 2 |
Reproductive biology | 1 |
Surgery | 4 |
Technology | 6 |
Textile industry | 1 |