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结壳 : 79 phrases in 11 subjects |
| Aviation | 8 |
| Construction | 4 |
| Drilling | 3 |
| Electronics | 5 |
| General | 16 |
| Geology | 7 |
| Machine components | 2 |
| Military | 1 |
| Name of organization | 1 |
| Quantum electronics | 1 |
| Technology | 31 |
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