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挑一挑 : 15 phrases in 9 subjects |
| Agriculture | 1 |
| Desert science | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Fencing | 1 |
| Finances | 2 |
| General | 5 |
| Oil / petroleum | 1 |
| Project management | 2 |
| United Nations | 1 |
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