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engineer check concrete structure in the tunnel underground construction.the background concept for train railway engineering tr
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dreamstime
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adult
background
boring
build
business
businessman
check
city
civil
concept
concrete
construction
engineer
engineering
equipment
hard
helmet
infrastructure
job
male
man
manager
mrt
people
person
professional
progress
railroad
railway
safety
site
station
structure
success
technology
train
transit
transport
transportation
tunnel
tunneler
tunneling
under
underground
urban
work
worker
workplace
young