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控制 计数 器控制 : 20 phrases in 9 subjects |
| Animal husbandry | 1 |
| Aviation | 1 |
| Construction | 1 |
| Electronics | 5 |
| General | 2 |
| Geophysics | 1 |
| Metallurgy | 3 |
| Space | 1 |
| Technology | 5 |
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