英文關鍵字
aluminum
background
bar
being
black
building
circling
close
construction
couple
cut
cutting
duct
engineering
equipment
factory
fixing
focus
gas
grinding
huge
industrial
industry
iron
labor
left
light
machine
machines
manufacturing
metal
moving
oil
palm
pan
people
pipe
pipes
plantation
pull
right
rod
safety
slider
spark
sparks
steel
tilt
tool
warehouse
welding
worker
workers