機器
background
chain
close up
cog
cogwheel
concept
connection
design
detail
dirty
empty
engine
engineering
equipment
gear
gearwheel
industrial
industry
machinery
macro
mechanical
mechanism
metal
metallic
motion
movement
nobody
oil
old
operation
operational
part
power
precision
rustic
science
steel
teamwork
technology
titanium
together
transmission
view
wheel
work