英文關鍵字
background
blade
circular
closeup
construction
cut
cutting
disc
disk
electric
equipment
factory
flash
grind
grinder
hand
industrial
industry
iron
light
male
man
manufacture
manufacturing
mechanic
metal
part
person
power
production
protection
rapid
rotate
round
saw
slowmo
slowmotion
spark
sparkle
speed
steel
technology
turning
work
workshop