英文關鍵字
helmet
safety
work
construction
industrial
industry
protection
hat
job
tool
building
contractor
engineer
equipment
hardhat
object
occupation
plan
professional
project
protective
yellow
hard
profession
protect
table
worker
architect
business
clean
crane
design
develop
development
engineering
estate
evening
housing
indenture
lie
man
necktie
new
property
sky
technician
top
town
urban
window