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光度级 : 15 phrases in 9 subjects |
| Earth sciences | 1 |
| Metallurgy | 2 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Technology | 5 |
| Telecommunications | 1 |
| Textile industry | 2 |
| United States | 1 |
| Wind Energy | 1 |
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