機器
abstract
action
backgrounds
business
circle
computer
concepts
connection
construction
control
cooperation
creativity
design
element
engine
engineer
equipment
figure
gear
group
ideas
illustration
image
industry
isolated
machinery
metal
objects
organization
painting
part
pattern
pinion
power
progress
red
set
shape
silhouette
solid
steel
symbol
teamwork
technology
teeth
turning
wheel
working