機器
accessibility
alloy
aluminium
auto
automobile
automotive
block
car
case
chromium
closeup
complexity
crank
cylinder
detail
diesel
disk
engine
equipment
gear
head
housing
industrial
inside
intake
iron
mechanic
metal
motion
motor
petrol
piston
power
section
self
shiny
silver
steel
system
technology
tool
transportation
valve
vehicle
warehouse
workshop