機器
broken
construction
crane
crushed
dirty
disposal
dump
ecology
electromagnetic
environment
environmental
equipment
factory
garbage
heavy
industrial
industry
iron
lifting
loading
manufacturing
material
metal
operation
plant
process
processed
production
recovery
recycle
recycling
reuse
rubbish
rust
scrap metal
scrapyard
sheet
steel
technology
tool
transport
transportation
trash
unloading
waste
work
worker
working
yard