英文關鍵字
roof
temporary
building
fence
construction
scaffolding
work
industry
site
industrial
equipment
structure
engineering
steel
scaffold
architecture
safety
occupation
worker
development
business
background
high
facade
frame
people
tower
maintenance
concrete
metal
platform
outdoors
helmet
builder
renovation
engineer
workplace
plant
officer
city
protection
person
fall
built
empty
crane
poles
exterior