close environmentalist hand researcher process taking sample contaminated water from lake |
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| navigate by keyword : agricultural air analyse analyze assistant biologist biotechnologist biotechnology blue chemical chemist close collecting consultant contaminated control danger ecologist environmentalist equipment glass gloves green hand importance infection laboratory lake liquid mask measuring medical microbiology natural nature open outdoor person pollution process protective researcher river sample science scientist shore sit squat substance suit taking test tube vegetation water |
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| Close-up environmentalist hand of a researcher in a process of taking a sample of contaminated water from a lake. |
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