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时机控制 : 29 phrases in 11 subjects |
| Audio electronics | 1 |
| Automobiles | 2 |
| Aviation | 3 |
| China | 1 |
| Electronics | 5 |
| General | 1 |
| Information technology | 3 |
| Metallurgy | 2 |
| Space | 4 |
| Technology | 6 |
| Textile industry | 1 |
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