英文關鍵字
acetylene
blue
carbon
construction
contains
cut
cutting
dangerous
equipment
factory
fire
flame
further
gas
gouging
hot
industrial
industry
large
light
manufacturing
metal
object
old
oxyfuel
oxygen
people
pipe
processing
recycle
recycling
safety
scrap
smelter
sparks
steel
technology
that
tools
torch
transported
twilight
uses
weld
welder
welding
work
worker