英文關鍵字
activity
beam
blue
bright
building
burn
burst
circular
city
construction
dark
equipment
explosion
fire
flames
flying
frame
height
helmet
industrial
industry
iron
large
light
man
manufacturing
mask
metal
move
night
object
objects
people
project
red
rush
safety
schedule
smoke
sparks
star
steel
tool
urban
weld
welder
welding
work
worker
working