英文關鍵字
architect
architecture
arm
blue
builder
built
caucasian
clothing
construction
contractor
employee
engineer
engineering
equipment
factory
foreman
hand
hardhat
hat
helmet
industrial
industry
inspection
inspector
labor
machine
male
man
manager
master
metal
metalworker
occupation
oil
outdoors
person
plant
protection
protective
refinery
safety
sky
steel
supervisor
technology
uniform
work
worker
working
workplace