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| 纵深作战 | |||
| English thesaurus | |||
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| DO | |||
| Deep Operations: 10 phrases in 6 subjects |
| Aviation | 1 |
| Dentistry | 1 |
| Metallurgy | 4 |
| Navigation | 1 |
| Oil and gas technology | 1 |
| Technology | 2 |
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