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| 铁心: 299 phrases in 22 subjects |
| Antennas and waveguides | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Ecology | 1 |
| Education | 1 |
| Electric machinery | 4 |
| Electrical engineering | 1 |
| Electricity | 7 |
| Electronics | 16 |
| Figure of speech | 7 |
| Foundry | 2 |
| General | 72 |
| Mechanic engineering | 4 |
| Metallurgy | 2 |
| Military | 1 |
| Oil processing plants | 1 |
| Physics | 1 |
| Radio | 5 |
| Rail transport | 9 |
| Technology | 157 |
| Transformers | 1 |
| Verbatim | 4 |
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