英文關鍵字
abstract
adult
background
ball
blue
charge
chemistry
class
college
color
colorful
concept
connection
crystal
electric
electricity
energy
finger
flash
glass
globe
glowing
hand
happy
human
lesson
light
lightning
magic
physics
plasma
plasmatron
power
school
science
shock
spark
sphere
technology
tesla
transparent
vacuum
voltage
young