燃やす
arc
bonding
busy
concentration
construct
creation
dangerous
employee
expertise
facility
fireplace
fireworks
flame
flash
gas
gloves
heat
helmet
horizontal
indoor
job
join
labor
lit
manual
manual worker
manufacturing
mask
mechanic
occupation
power
production
protective
repairing
repairman
safety
skill
spark
structural
team
teamwork
technical
torch
trained
visor
welder
worker