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| 砾土 | |||
| 砾质土 | |||
| 砾石土; 砂砾土 | |||
| 砾质土; 砾石类土 | |||
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gravel soil : 8 phrases in 3 subjects |
| Bridge construction | 1 |
| Rail transport | 5 |
| Technology | 2 |
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