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| 不透水层; 隔水层 | |||
| 不渗透层 | |||
| 不透水岩层 | |||
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impermeable bed : 9 phrases in 5 subjects |
| Bridge construction | 1 |
| Electronics | 1 |
| Engineering geology | 4 |
| Hydroelectric power stations | 1 |
| Technology | 2 |
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