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| 不透水层 | |||
| 不透水地层 | |||
| 防渗水地层; 不透气层; 不渗透地层 | |||
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| 不透水层 | |||
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impervious stratum : 3 phrases in 2 subjects |
| Bridge construction | 2 |
| Technology | 1 |
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