英文關鍵字
air
apparatus
atmosphere
auto
automotive
burning
car
change
collecting
combustion
development
ecologic
ecological
ecologically
ecology
electronic
emission
energy
engine
exhaust
fuel
gas
gases
harmful
maintenance
mechanical
mechanically
motor
part
process
recirculate
recirculation
reduce
repair
service
substances
technic
technology
valve
vent
white