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| переписка; обмениваться письмами; письменно | |||
| циркулярное письмо | |||
| 通函: 28 phrases in 10 subjects |
| Business | 2 |
| Corporate governance | 2 |
| Electronics | 1 |
| General | 16 |
| Jet engines | 1 |
| Mathematics | 1 |
| Military | 1 |
| Statistics | 1 |
| Technology | 2 |
| Work flow | 1 |
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