機器
advantage
atom
balance
brochure
diagram
education
educational
effort
energy
engineering
experience
explanation
far away
force
formula
gear
graphic
gravity
info
infographic
lab
laboratory
law
learning
load
magnetic
mathematics
mechanic
mechanical
mechanism
model
motion
movement
moving
physics
power
scheme
school
science
simple
steel
surface
system
teacher
technical
tool
weight
wheels
work
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