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