英文關鍵字
actions
animation
backgrounds
cartoon
circle
cog
connection
construction
design
development
element
engine
engineering
equipment
gear
green
group
icon
illustration
illustrations
industrial
industry
isolated
large
machine
machinery
mechanical
metal
motion
organization
part
pinion
power
progress
rotate
rotation
round
shape
sign
small
solid
solution
steering
symbol
technology
teeth
tool
toothed
wheel
work
yellow