機器
big
bore
breakthrough
build
circular
city
coal
cocrete
construction
cutter
deep
dig
drill
drilling
electric
electrical
engineering
equipment
excavator
head
hole
huge
industrial
industry
large
machinery
metro
metropolitan
mine
mining
old
pipe
railroad
railway
road
shield
station
technology
train
transport
transportation
tube
tunnel
tunnelling
ukraine
underground
urban
way