機器
background
business
childhood
circle
clockwork
cogwheel
color
colorful
concept
conceptual
energy
engine
engineering
equipment
fun
gear
green
industrial
industry
isolated
kid
machinery
mechanics
mechanism
metal
metallic
motion
object
power
precision
red
rotate
rotation
spin
steel
team
teamwork
technical
technology
teeth
toy
transmission
turn
wheel
whirligig
white
wood
work
young