worker scientist wearing protective coverall and gas mask doing ecological tests the roof |
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| navigate by keyword : air analysis biochemist biological biology biotechnologist building chemical chemistry coverall danger desperately disaster doctor ecologist ecology environmental epidemic experiment expertise health human laboratory measuring nature people planet pollution problem protect protection protective purity quality radiation research researcher roof science scientific scientist substance thinking top ukraine uniform urban walk |
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| Scientist wearing white protective coverall and gas mask, walking on the roof of an urban building. On the background a rising sun and foggy weather. Copy space. Concept of environmental problem |
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