機器
auto
backdrop
background
bolt
circle
close up
coating
concept
construction
copper
design
detail
device
energy
engineering
equipment
gear
heavy
industrial
industry
iron
machinery
machining
mechanical
mechanism
metal
modern
motor
nut
part
pattern
power
precision
process
rod
rolling
rotation
round
shaft
shine
smooth
stainless
steel
technology
template
tool
transportation
turning
wheel