機器
activity
agriculture
auger
background
bore
borehole
clay
concrete
construction
deep
dig
dirt
drill
drilling
earth
energy
engineering
equipment
farming
field
garden
green
ground
hole
industrial
industry
isolated
machinery
male
man
manual
metal
mining
nature
outdoor
plant
power
professional
rig
sand
site
soil
steel
technology
tool
vehicle
well
work
worker