英文關鍵字
automatic
background
black
blue
bottle
chemical
chemistry
clean
closeup
depot
equipment
factory
glove
grained
granulate
granule
granules
gray
heavy
industrial
industry
logistic
maintenance
manufacture
manufacturing
material
mix
mixing
nopeople
packaging
pellets
pipe
plastic
plumber
plumbing
polyethylene
polymer
polymerization
polypropylene
polystyrene
powder
production
raw
recycling
storehouse
strew
substance
technology
thermoplastic
vessel
wide