英文關鍵字
activity
background
build
builder
cement
columns
concrete
construction
contractor
crushed
economic
equipment
foundation
gravel
improve
industrial
industry
infrastructure
iron
liquid
marl
mason
material
mix
mixed
mixer
mixing
mortar
piles
plasterer
plastering
pour
pouring
public
ready
reinforced
reinforcement
renewal
repair
residential
road
roadworks
safety
service
site
steel
stone
structures
wet
work
worker