Senior man wearing scientist uniform measuring liquid at laboratory
Palabras clave
senior,
elderly,
mature,
grey-haired,
person,
portrait,
adult,
caucasian,
old,
problem,
worry,
worried,
sleepy,
stress,
stressed,
science,
research,
medicine,
scientist,
experiment,
technology,
medicals,
professional,
microscope,
chemist,
biology,
analysis,
men at work,
working,
tube,
test,
goggles,
clipboard,
checklist,
scale,
weighing-machine,
liquid,
measure,
measuring,
clinic,
center,
hospital,
room,
indoor,
indoor,
laboratory,
laboratory,
chemistry
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