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保养 期 : 21 phrases in 10 subjects |
| Animal husbandry | 2 |
| Architecture | 1 |
| Automobiles | 2 |
| Commerce | 1 |
| Economy | 1 |
| Hydroelectric power stations | 1 |
| Management | 1 |
| Oil / petroleum | 5 |
| Rail transport | 1 |
| Technology | 6 |
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