英文關鍵字
abterminal
acceleration
advehent
afferent
axipetal
centripetal
circling
circular
closeup
disk
divective
esodic
experiment
experimentanium
gold
golden
indoor
inside
laboratory
mechanics
metal
metallic
motion
nobody
noone
nopeople
object
orbit
path
physics
progress
ride
ring
roll
rotate
round
slide
speed
spin
subcircular
surface
wheel