機器
alloy
aluminum
auto
automobile
background
block
bright
cam
camshaft
car
chromium
circle
complexity
cylinder
detail
diesel
energy
engine
equipment
fuel
gear
head
heart
industry
inside
iron
machinery
metal
metallic
motor
motorcycle
oil
old
open
part
petrol
power
repair
section
service
shiny
silver
stainless
steel
technology
transportation
used
valve
vehicle