Professors explaining operation of water ultra purification system and submicron filters to engineering students in a laboratory

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Five People, Horizontal, Indoors, Looking Away, Mature Adult, Mid Adult, Photography, Senior Adult, Side View, Three-quarter Length, Young Adult, Chinese Ethnicity

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Size: 5616px × 3744px
Location: Needham, Massachusetts, USA
Photo credit: © Disability Images / Alamy / Afripics
License: Royalty Free
Model Released: Yes

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