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火花电蚀 : 15 phrases in 8 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Metallurgy | 5 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Technology | 3 |
| Textile industry | 2 |
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