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| 底部横坑道; 海底漂移; 下导坑; 下部导坑; 下部导洞; 下部半断面; 底部导洞 | |||
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bottom drift : 11 phrases in 4 subjects |
| Agriculture | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Technology | 8 |
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