英文關鍵字
background
black
bottle
chemical
chemistry
circle
equipment
factory
finished
flour
footage
glove
grained
granulate
granule
granules
gray
heap
industrial
industry
manufacture
manufacturing
material
mix
mixing
modern
object
pellets
pipe
pipeline
piping
plastic
polyethylene
polymer
polypropylene
polyvinyl
production
raw
recycling
resource
steel
strew
substance
technology
thermoplastic
through
ventilation