燃やす
accident
acid
arm
assistant
care
caution
chemical
chemicals
chemistry
corrosion
corrosive
danger
dangerous
dead
durable
environment
factory
glove
hand
hazard
hazardous
health
help
hydroxide
industry
lab
label
laboratory
liquid
nitric acid
plastic
poison
poisonous
potassium
pour
prevent
protector
quality
reaction
resistant
risk
safety
skin
substance
symbol
test
toxic
warning
water