worker scientist wearing protective coverall and gas mask doing ecological tests the roof |
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| navigate by keyword : air analyze biochemist biological biology biotechnologist building chemical chemistry coverall danger disaster doctor ecologist ecology environmental epidemic experiment expertise fog grey human laboratory looking measuring nature people planet pollution professional protect protection protective quality radiation railing research researcher science scientific scientist smoke substance test top uniform urban virus working |
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| Scientist wearing white coverall and gas mask, walking on the roof of an urban building with his back to a rising sun in foggy weather, concept of air pollution |
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