英文關鍵字
abstract
advanced
animated
automated
background
blue
building
business
chemical
chemistry
crane
electricity
energy
engineering
environment
equipment
factory
fuel
future
futuristic
gas
gasoline
graphic
heavy
industrial
industry
inside
iron
line
machine
machinery
manufacturing
metal
natural
oil
petroleum
pipe
pipeline
plant
pollution
power
refinery
sky
smoke
steel
storage
tank
technology
toxic
tube