A man in a blue shirt with glasses and a shaved down head is looking at a microscope in a laboratory .
a man works at a lab
A man in a blue shirt with glasses and a shaved down head is looking at a microscope in a laboratory.
a man works at a lab
If the man is looking at a microscope then he works there.  A lab is another word for a laboratory.
If the man is looking at a microscope then he works there . A lab is another word for a laboratory .