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| pollution de cours d'eau | |||
| pollution de rivière; pollution des fleuves | |||
| pollution des rivières (water pollution, pollution de l'eau) | |||
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| pollution des rivières (pollution de l'eau) | |||
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river pollution : 4 phrases in 3 subjects |
| Environment | 2 |
| Life sciences | 1 |
| Natural resourses and wildlife conservation | 1 |
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