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| confining bed; confining layer | |||
| limiting layer | |||
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限制层 : 15 phrases in 9 subjects |
| Aviation | 1 |
| Cables and cable production | 1 |
| Desert science | 1 |
| Electronics | 1 |
| Exhibitions | 1 |
| Logistics | 2 |
| Space | 2 |
| Technology | 2 |
| Water resources | 4 |
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