機器
asphalt
compactor
construction
developing
disposal
dump
earth
environment
equipment
food
forest
garbage
heavy
household
industrial
industry
land
landfill
litter
machinery
material
methane
most
pavement
paving
pollution
power
refuse
road
roller
rubbish
site
steam
steamroller
street
toxic
transportation
truck
vehicle
waste
water
wild
work
world
yellow