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circulation system |
流通系统 : 34 phrases in 14 subjects |
Agriculture | 2 |
Air defense | 1 |
Astronautics | 1 |
Aviation | 1 |
Business | 2 |
Earth sciences | 1 |
Economy | 1 |
Electronics | 9 |
General | 1 |
Labor organization | 2 |
Librarianship | 5 |
Space | 2 |
Technology | 3 |
Telecommunications | 3 |