英文關鍵字
are
background
body
car
closeup
cogs
concept
design
elevatorn
engine
engineering
equipment
factory
footage
gear
gears
grain
grey
industrial
industry
iron
lighting
machine
mechanical
mechanics
mechanism
metal
metallic
motion
natural
old
parts
people
precision
probe
process
rotate
spares
spinning
steel
takes
technology
teeth
that
transmission
turns
wheel
wheels
working