英文關鍵字
plastic
polymer
polyethylene
polypropylene
composite
polystyrene
hand
texture
technology
industry
granulate
industrial
material
particle
pellets
raw
substance
pvc
factory
thermoplastic
extrusion
grain
petrochemical
recycling
science
clear
compound
hold
pile
molding
production
acetate
color
ethylene
granules
handful
heap
white
small
plant
manufacturing
assemble
fabrication
group
make
manual
many
mechanical
parts
similar