機器
bulldozer
cambodia
conduit
construction
digging
dirty
ditch
drainage
drink
dust
energy
engineering
environmental
equipment
excavator
ground
heavy
hole
industry
infrastructure
job
large
municipal
outdoor
penh
phnom
pipe
pipeline
pit
plumbing
pollution
power
problem
pumping
quarry
reconstruction
rock
safety
sand
shovel
site
system
technology
transportation
trench
utility
vehicle
water
work