英文關鍵字
alloy
aluminum
bin
bright
cargo
close
clothing
consumption
damage
detail
discard
discarded
dump
ecology
environmental
factory
fire
garbage
hard
heap
industrial
industry
iron
landfill
leftover
litter
man
mess
metal
package
parts
polluted
pollution
processing
production
raw
recycling
save
separation
sorting
sparks
steel
tool
tram
transportation
trash
uniform
welding
wheel
worker