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| 垫层用砂 | |||
| 地基砂层; 垫层用砂 | |||
| 垫芯砂; 垫箱砂 | |||
| 垫层砂; 砂垫层 | |||
| bedding sand: 12 phrases in 4 subjects |
| Construction | 1 |
| Engineering geology | 3 |
| Hydroelectric power stations | 1 |
| Technology | 7 |
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