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群作用 : 17 phrases in 12 subjects |
| Agriculture | 3 |
| Bridge construction | 2 |
| Business | 1 |
| Cryptography | 2 |
| Dermatology | 1 |
| Desert science | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Genetics | 1 |
| Metallurgy | 1 |
| Technology | 2 |
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