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backup | |||
backlog |
备用物: 28 phrases in 15 subjects |
Aviation | 2 |
Business | 1 |
Commerce | 1 |
Drilling | 1 |
Earth sciences | 2 |
Economy | 2 |
General | 5 |
Geophysics | 1 |
Household appliances | 1 |
International trade | 1 |
Name of organization | 1 |
Space | 1 |
Sports | 1 |
Technology | 5 |
United Nations | 3 |