英文關鍵字
area
background
black
chemical
chemistry
circles
colorful
continuous
crimped
drainage
equipment
factory
filling
glove
grained
granulate
granule
granules
gray
heap
industrial
industry
lldpe
machine
manufacture
manufacturing
material
mix
mixing
nobody
pellets
pipe
pipes
plastic
polycarbonate
polyethylene
polymer
polypropylene
pour
production
raw
recycling
repair
strew
substance
system
technology
thermoplastic
ventilation