英文關鍵字
balance
cable
child
childhood
circling
construction
crane
cylinder
defect
disbalance
effect
exercise
exhibition
experiment
experimentanium
fault
finger
frame
hand
hang
hold
human
indoor
inside
kid
laboratory
learn
mechanics
mechanism
motion
move
movement
object
physics
plate
pull
pulley
rope
rotates
row
school
shift
spin
study
sway
swing
turn
warp
weight
wooden