機器
assembling
background
bricks
building
business
busy
caucasian
confident
construction
contractor
crane
development
effort
employment
engineer
equipment
face
foremaster
form
guy
hard hat
helmet
industrial
industry
job
labor
male
manual
metal
modern
occupation
one
person
placement
portrait
reinforcement
safety
serious
skilled
steel
success
support
technology
tool
uniform
wear
white
worker
young