機器
abstract
alloy
aluminum
annealing
automotive
belts
black
cams
camshaft
car
chain
combustion
cover
cylinder
diesel
drive
engine
engineering
equipment
gear
heavy
industry
injection
inside
internal
machinery
mechanical
mechanics
metal
model
motor
motorcycle
noise
overheated
pistons
power
pulleys
racing
section
silver
steel
temper
timing
transmission
transportation
valve
vehicle
wearing
white