英文關鍵字
abstract
action
background
business
chrome
circle
close
closeup
concepts
construction
creative
effect
efficiency
electric
energy
engineering
equipment
eternal
everyday
experiment
indefinitely
industry
innovation
invention
machine
mechanism
metal
motion
movement
object
perpetual
physics
power
rolling
rotating
round
routine
science
solution
speed
spinning
steel
teamwork
technology
time
turning
up
wheel
working