機器
beams
cement
concrete
construction
corner
danger
direction
dirt
dirty
excavation
fill
flow
foundation
full
girders
grid
guide
hard hat
hazard
hole
hose
i beams
industry
iron rods
labor
laborer
man
manual
messy
metal
mold
piles
pipe
productivity
pump
rebars
reinforcements
rubble
slurry
solo
steel
sunken
surface
swirl
topping up
tube
wet
work
work site