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自 振荡 : 121 phrases in 20 subjects |
| Agriculture | 1 |
| Automated equipment | 1 |
| Automobiles | 5 |
| Aviation | 4 |
| Bridge construction | 2 |
| Computer numerical control | 1 |
| Construction | 1 |
| Drilling | 1 |
| Earth sciences | 1 |
| Electric machinery | 5 |
| Electronics | 24 |
| General | 6 |
| Information technology | 1 |
| Mathematics | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 6 |
| Space | 10 |
| Technology | 42 |
| Telecommunications | 1 |
| Wind Energy | 5 |
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