英文關鍵字
1080
abstract
belt
car
combustion
design
engine
engineering
gear
gears
hard
illustration
industry
inside
machine
machinery
mechanical
mechanism
metal
motor
movement
pick
piston
speed
start
technical
technology
ttransparent
work
working
英文關鍵字
1080
abstract
belt
car
combustion
design
engine
engineering
gear
gears
hard
illustration
industry
inside
machine
machinery
mechanical
mechanism
metal
motor
movement
pick
piston
speed
start
technical
technology
ttransparent
work
working