英文關鍵字
safety
equipment
uniform
job
helmet
danger
work
harness
steel
industry
scaffolding
worker
structure
site
high
industrial
dangerous
construction
building
belt
builder
height
engineering
professional
risk
man
architecture
climb
security
protective
activity
background
repair
roof
people
training
reinforcement
concrete
protection
crane
manual
workers
accident
beam
stands
carpenters
extreme
roofer
closeup