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| 料层; 料堆 | |||
| 材料过滤层 | |||
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material bed : 65 phrases in 7 subjects |
| Architecture | 1 |
| Desert science | 1 |
| Hydroelectric power stations | 5 |
| Metallurgy | 7 |
| Oil / petroleum | 1 |
| Technology | 48 |
| Water resources | 2 |
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