英文關鍵字
activity
area
building
cement
concrete
construction
equipment
form
gravel
grey
heavy
hole
hydraulic
industrial
industry
level
liquid
machine
machinery
making
masonry
mover
new
pave
pipe
power
produce
repair
road
sand
sewer
shovel
sidewalk
site
street
supply
technology
transport
tube
urban
utility
vehicle
way
work
worker