機器
backhoe
big
bucket
crawler
dig
digging
dirty
dredging
dump
equipment
escarpment
excavator
exploiting
foggy
gear
hardware
heavy
industrial
industry
large
loader
machinery
mechanism
mechanization
metal
metallurgy
mine
mining
mover
mud
muddy
navvy
old
outdoors
potent
powerful
quarry
resources
scarp
scoop
shovel
smog
smoke
steel
tracks
transport
turned
work