機器
agronomics
agronomy
bulldozer
caterpillar
caterpillar tracks
chain
construction
continuous
continuous tracks
crawler
detail
drive wheel
earthmover
equipment
excavator
farm
farming
industrial
installation
machinery
metal
metal tracks
new
old
outdoor
outdoors
parts
pillar
propulsion
repairs
replacement
rolled
rust
snow
snowcat
snowmobile
sprocket
steel
tank
tape
track
tracked
tracks
tractor
vehicle
wheel
white
wild
winter