機器
antique
background
bore
building
construction
design
dig
drill
drilling
drinking
electric
electrical
energy
engine
factory
flow
garden
ground
groundwater
hole
industrial
industry
iron
machinery
metal
modern
motor
people
pipe
plant
plumb
power
pressure
pump
pvc
retro
rural
soil
steel
submersible
summer
technology
tube
underground
valve
water
well
wells
work