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| ram med in layer | |||
| tamping in layers; ramming in layers | |||
| compaction in layers; rammed in layers | |||
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| compaction by layers | |||
| 分 层夯实: 6 phrases in 4 subjects |
| Bridge construction | 2 |
| Engineering geology | 1 |
| Metallurgy | 1 |
| Technology | 2 |
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