機器
activity
background
canal
civil
conduit
connect
danger
dawn
dig
dirt
employment
energy
equipment
excavation
excavator
ground
heat
hydraulic
industrial
industry
infrastructure
installation
job
labor
land
lay
line
machinery
network
new
pipe
pipeline
power
protective
round
sand
scoop
sewage
sewer
site
sunrise
supply
technology
track
trench
tube
underground
valve
work
定額
Tracked excavator with a bucket in the ground at a construction site during the laying of sewer pipes in the ground, against a blue sky and sunset. Engineering and heating systemsの素材 [FY310120662324]
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