英文關鍵字
actuator
auto
automatic
automobile
automotive
background
belt
blue
business
cam
car
chain
chains
chrome
circle
closeup
cog
complex
complexity
compression
conveyor
design
detail
device
diesel
drill
drive
efficient
electric
electrical
elements
energy
engine
engineering
equipment
factory
fingers
food
fuel
gear
gearbox
gears
hardware
industrial
industry
iron
line
machine
machinery
manufacturing
mechanic
mechanical
mechanism
metal
metallic
motor
motorcycle
old
part
power
precision
production
repair
robot
roller
row
rust
set
shaft
sprocket
steel
technology
tool
tooth
transmission
transportation
vehicle
wheel
white
work