英文關鍵字
blue
builder
building
commercial
concrete
construction
contractor
crane
danger
development
engineer
engineering
equipment
foreman
hand
heavy
helmet
hook
industrial
industry
job
lift
lifting
machine
machinery
male
man
material
men
metal
occupation
operator
outdoors
people
person
project
protection
safety
site
sky
steel
structure
technology
tower
transportation
urban
work
worker
yellow