英文關鍵字
apprentice
apprenticeship
business
caucasian
colleagues
construction
control
engineer
engineering
engineers
equipment
factory
generation
helmet
indoor
industrial
industry
job
labor
machine
machinery
male
man
manager
manufacture
manufacturing
men
metal
methods
occupation
operator
person
plant
production
professional
professionally
protection
safety
sheet
standing
steel
studying
supervisors
taught
team
teamwork
technician
technology
trainee
training
warehouse
woman
work
worker
working
workplace
workshop