英文關鍵字
aluminum
automation
metallurgical
business
construction
device
ecology
energy
engine
engineering
equipment
factory
gears
gray
harmful
heavy
industrial
iron
machine
machinery
manufacture
manufacturing
metal
mill
chimney
plant
power
press
processing
production
rotate
roll
rolling
samara
steel
steam
smoke
technical
technology
tool
wind
work
workshop
time
lapse
timelapse
wide
wideangle