英文關鍵字
aluminium
arc
assembly
automation
building
business
caucasian
closeup
coolant
engineering
equipment
factory
focusing
glasses
indoor
industrial
industry
interior
job
join
labor
light
machine
machinery
macro
manufacturing
mechanic
mechanical
mechanism
metal
metalworker
people
person
plant
production
profession
retro
room
safety
shipyard
spark
steel
technician
technology
tool
trained
work
worker
workshop