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| slow filter | |||
| retarded filter | |||
| slow sand filter (water treatment) | |||
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filtre lent : 25 phrases in 10 subjects |
| Agriculture | 3 |
| Chemistry | 1 |
| Commerce | 1 |
| Communications | 2 |
| Cultural studies | 1 |
| Earth sciences | 3 |
| Electronics | 1 |
| Environment | 6 |
| General | 6 |
| Technology | 1 |
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