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| soil subgrade; soil roadbed | |||
| basement soil; bedding in soil; earth grade; earth roadbed; unsurfaced subgrade | |||
| 土路基: 37 phrases in 5 subjects |
| Bridge construction | 11 |
| Electronics | 1 |
| Engineering geology | 1 |
| Rail transport | 8 |
| Technology | 16 |
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