機器
environmental
biohazard
bulldozer
collecting
contamination
crushed
danger
destruction
dirty
disposal
dump
dump truck
dumpster
ecology
engine
environment
environmental conservation
excavator
garbage
garbage dump
garbage truck
harm
hazardous
industrial
junk
landfill
landfill site
material
metal
pile
pollution
recycle
recycling
resource
rot
rubbish
scrap
scrapyard
toxic
trash
waste