albert
albert einstein
answer
background
blackboard
board
business
calculation
class classroom
classroom
college
concept
drawing
education
education learning
emc2
energy
equation
formula
genius
hand
handwriting
homeschool homework
homework
intelligence
knowledge
lanturn
learn
lesson
mass
math
mathematical
mathematics
online learning
physics
relativity
research
school
science
sir isaac newton
sketch
student
study
studying
symbol
teacher
technology
theory
university
write
定額
A scientist is studying physics and a lamp shines and sees the equation E mc square in his hand.の素材 [FY310210609340]
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