arrow
atom
black
blackboard
board
calculation
caucasian
chalk
chalkboard
chemical
chemistry
class
clean
close
college
concept
draw
drawing
education
graph
graphic
green
hand
handwriting
holding
horizontal
illustration
line
liquid
mature
molecule
numbers
one
person
school
science
scientific
student
style
stylish
teach
teacher
text
university
up
white
work
write
writing
young
定額
A teacher writing science, drawing chemistry elements on clean green chalkboard by handの素材 [FY31053474314]
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![Green Woodpecker (Picus viridis). Russia, Moscowの素材 [FY31083071009]](https://images.assetsdelivery.com/compings_v2/ornitolog82/ornitolog821707/ornitolog82170700068.jpg "Green Woodpecker (Picus viridis). Russia, Moscowの素材 [FY31083071009]")