機器
action
aiming
architecture
arm
build
builder
building
business
cargo
cement
chain
concrete
concrete pump
construct
construction
construction site
contract
contractor
crane
delivery
development
flood
group
helmet
industry
link
liquid
lorry
man
mesh
metal
operation
people
place
pouring
process
pump
pumping
safety
site
stage
structure
truck
tube
vehicle
work
working
workman