worker scientist wearing protective coverall and gas mask doing ecological tests the roof |
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| navigate by keyword : air biochemist biological biology biotechnologist building chemical chemistry coverall danger disaster ecologist ecology environment epidemic examine experiment expertise fog human laboratory measuring nature one panoramic people planet pollution professional protect protection protective purity quality quarantine radiation research researcher science scientific scientist sos stop test top toxic uniform urban working |
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| Panoramic snapshot of a man wearing white coverall and gas mask, standing on the roof of a high storey building, looking at a glass flask with blue substance, making research on air pollution subject |
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