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| 砂砾垫层砂石垫层 | |||
| 砂石垫层 | |||
| 砂砾垫层; 砂石墊層 | |||
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sand-gravel cushion : 6 phrases in 4 subjects |
| Architecture | 1 |
| Bridge construction | 2 |
| Desert science | 1 |
| Technology | 2 |
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