選択的
adjust
build
close up
construct
construction
construction vest
constructor
contractor
control
development
distribution
employee
employment
engineer
facility
factory
foreman
glove
helmet
industrial
industry
job
labor
maintain
man
manufactory
manufacture
mechanic
multiethnic
multiracial
occupation
operate
outdoors
pipeline
plant
production
professional
service
supervisor
system
uniform
valve
work
worker
workman