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предотвращение загрязнения | |||
контроль чистоты воды и воздуха; поддержание чистоты |
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 |