機器
automobile
crane
dump
ecology
environment
equipment
factory
flat
garbage
heap
illustration
industrial
industry
iron
junk
junkyard
landfill
linear
male
man
metal
open claw
outline
people
person
pile
plant
pollution
protection
recycle
recycling
refuse
reuse
rubbish
rust
rusty
scrap
service
sorting
steel
technology
trash
utility
utilization
vector
waste
work
worker
yard