機器
environmental
backhoe
beautiful
bulldozer
colorful
dig
dirt
dirty
disposal
dump
ecology
engineering
environment
excavator
garbage
heap
junk
junkyard
landfill
landscape
loader
machinery
pile
plastic
pollution
recycle
recycling
reflection
rubbish
scoop
scrap
silhouette
stack
steel
sun
sunlight
sunrise
sunset
thailand
toxic
tractor
transport
trash
travel
twilight
vehicle
waste
water
yellow