機器
accuracy
adults
automated
buildings
business
chemical
contemporary
control
electricity
electrolyte
employment
energy
engineer
engineering
equipment
expertise
factory
hardhat
indoors
industrial
industry
laboratory
machinery
manual
manufacturing
material
mature
people
power
production
professional
protective
quality
repairing
safety
science
skill
sparks
stainless
steel
team work
technician
technology
tool
valve
work
worker
workshop