worker scientist wearing protective coverall and gas mask doing ecological tests the roof |
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| navigate by keyword : biochemist biological biology biotechnologist building chemical chemistry coverall danger disaster doctor ecologist ecology environmental epidemic escape experiment expertise fog human laboratory measuring nature people planet pollution professional protection protective purity quality radiation research researcher retreat roof run science scientific scientist smog smoke substance suit sunrise test top uniform urban |
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| Man wearing white coverall and gas mask, running on the roof of an urban building with his back to a rising sun in foggy weather, concept of environmental problem |
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