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| 底层; 基层 | |||
| 基极层 | |||
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base layer : 14 phrases in 9 subjects |
| Bridge construction | 3 |
| Ecology | 1 |
| Electronics | 1 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Rail transport | 2 |
| Semiconductors | 1 |
| Shipbuilding | 1 |
| Technology | 3 |
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