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| предотвращение загрязнения | |||
| контроль чистоты воды и воздуха; поддержание чистоты | |||
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prévention de la pollution : 22 phrases in 8 subjects |
| Ecology | 2 |
| Environment | 1 |
| Forestry | 1 |
| International law | 1 |
| Name of organization | 3 |
| Natural resourses and wildlife conservation | 3 |
| Nuclear physics | 3 |
| United Nations | 8 |
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