機器
3d
abstract
accuracy
background
business
cog
cogs
construction
cut off
damage
danger
design
drive
engineering
equipment
gear
gears
idea
industry
iron
machine part
mechanic
mechanical
mechanism
metal
metallic
motion
object
oblique
part
power
precision
rotate
rotation
shape
shiny
spiral
steel
teamwork
technology
teeth
texture
tooth
toothed
torque
transmission
vintage
wheel
wheels