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| 卵石滤水器; 砾石滤水器 | |||
| 砂砾滤层; 砾石过滤器 | |||
| 砾石滤层 | |||
| 砾石过滤器池 | |||
| 细卵石过滤器; 砾石填料; 砾石滤池; 护底碎石; 砂砾滤池 | |||
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gravel filter : 33 phrases in 5 subjects |
| Ecology | 1 |
| Engineering geology | 1 |
| Metallurgy | 1 |
| Rail transport | 4 |
| Technology | 26 |
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