英文關鍵字
acetylene
alone
closeup
construction
cutting
dangerous
energy
equipment
expertise
fire
fix
flame
flash
gas
gloves
glow
grating
hazardous
helmet
hot
human
industrial
iron
isolated
job
labourer
lattice
male
man
manufacturing
metal
metalware
metalwork
one
orange
person
production
profession
protection
repair
safety
spark
steel
technology
tools
torch
uniform
wall
weld
worker