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力的效应 : 16 phrases in 9 subjects |
| Animal husbandry | 1 |
| Automobiles | 3 |
| Bridge construction | 2 |
| Cosmetics and cosmetology | 1 |
| Ecology | 1 |
| Explosives and Explosive Ordnance Disposal | 3 |
| General | 1 |
| Project management | 1 |
| Technology | 3 |
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