英文關鍵字
trench
shovel
man
worker
electrician
dig
soil
repair
drainage
sewerage
site
outdoors
build
canalization
connection
construction
dirty
ditch
drain
work
equipment
industrial
infrastructure
installation
installing
manual
earth
background
laborer
dirt
job
crude
tool
structure
process
pollution
heavy
city
renewal
roadworks
street
urban
maintenance
activity
black
gravel
ground
cable