3四分の一の長さ
caucasian
color image
concentration
curiosity
discovery
education
exploration
girl
holding
indoors
intelligence
labcoat
laboratory
laboratory equipment
learning
man
microscope
mid adult
observation
observing
occupation
petri dish
profession
research
science
scientific experiment
scrutiny
sensory perception
side view
student
teacher
teenager
tweezer
two people
using
waist up