英文關鍵字
sulfur
chemical
chemistry
acid
sulfuric
element
poison
science
corrosive
laboratory
toxic
mineral
industrial
symbol
lab
burn
skin
dangerous
liquid
industry
yellow
risk
nature
isolated
substance
hazardous
hazard
material
gas
label
warning
glass
danger
reaction
molecular
white
compound
powder
health
atom
object
factory
sulphuric
research
natural
molecule
safety
background
animated
video
scattered
words
simple