機器
activities
activity
adults
belt
belt drive
belts
children
clockwise
counterclockwise
direction
drive
education
fun
game
games
gear
gears
gearwheel
illustration
iq
leisure
machinery
math
mathematics
mechanics
mechanism
motion
page
pinion
puzzle
puzzles
quiz
riddle
riddles
rotate
rotating
rotation
school
skills
spatial
test
training
visual
wheel
worksheet
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