英文關鍵字
background
batch
black
chemical
chemistry
closeup
commodities
day
drain
equipment
factory
glove
grained
granulate
granule
granules
gray
heap
industrial
industry
length
machinery
manufacture
manufacturing
material
mix
mixing
movement
pellets
pipe
plastic
plumber
plumbing
polycarbonate
polyethylene
polymer
polypropylene
pour
process
production
raw
recycling
red
rubber
special
strew
substance
system
technology
thermoplastic