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| be in doubt about (what, whether) | |||
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未确定 : 49 phrases in 21 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Architecture | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Business | 7 |
| China | 2 |
| Commerce | 4 |
| Economy | 6 |
| Finances | 1 |
| Fishery fishing industry | 1 |
| General | 5 |
| Genetics | 2 |
| Hydroelectric power stations | 1 |
| International trade | 2 |
| Management | 1 |
| Project management | 2 |
| Securities | 2 |
| Space | 1 |
| Technology | 5 |
| Textile industry | 2 |
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