![A professor explaining a biogas plant to the audience A professor explaining a biogas plant to the audience](/sites/default/files/styles/fullhd/public/background/dsc09209.jpg?itok=PvMuXseI)
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A professor explaining a biogas plant to the audience.
serie
photos
Cam
NEX-7
Exposer Time
1/400s
Aperture
f/6.3