機器
back actor
backhoe
boom
cab
caterpillar
civil
construct
construction
device
digger
dirty
engine
engineering
equipment
excavating
excavator
grass
green
grunge
grungy
heavy
hydraulic
industrial
iron
link
machinery
mire
muck
mud
muddy
off road
old
rear actor
rust
rusty
slime
sludge
soil
steel
technology
trace
track
tractor
trail
vehicles
way
wet
yellow