英文關鍵字
alloy
aluminium
auto
automobile
car
closeup
complexity
cylinder
diesel
dimensional
energy
engine
engineering
equipment
exploding
fuel
gasoline
gear
horsepower
ignition
industrial
industry
innovation
inside
loop
machine
machinery
mechanic
mechanical
metal
metallic
motion
motor
part
people
pipe
piston
power
ring
rod
shiny
speed
sports
steel
technology
three
transportation
truck
turning
valva
vehicle