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生 产开发 : 15 phrases in 12 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| China | 1 |
| Earth sciences | 1 |
| Economy | 1 |
| Fishery fishing industry | 1 |
| Geology | 1 |
| Mining | 2 |
| Oil / petroleum | 2 |
| Shipbuilding | 1 |
| Technology | 2 |
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