選択的
action
background
balance
ball
bouncing
business
closeup
concept
conservation
cradle
demonstrative
design
device
educational
effect
element
energy
focus
gravity
hand
hanging
impact
kinetic
law
leadership
light
male
man
metal
momentum
motion
movement
newton
office
pendulum
person
physics
playing
push
reaction
row
science
sphere
success
swing
table
toy
work
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