英文關鍵字
alpha
equipment
ferromagnetic
field
horse
horseshoe
magnet
magnetic
matte
metal
north
object
polarity
poles
red
rotate
shoe
south
spin
英文關鍵字
alpha
equipment
ferromagnetic
field
horse
horseshoe
magnet
magnetic
matte
metal
north
object
polarity
poles
red
rotate
shoe
south
spin