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| fossé d'oxydation | |||
| bassin d'oxydation | |||
| étang d'oxydation; lagune aérée d'oxydation; étang d'eaux usées; étang de stabilisation | |||
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oxidation pond : 10 phrases in 2 subjects |
| Environment | 4 |
| Natural resourses and wildlife conservation | 6 |
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