英文關鍵字
alkalis
ash
base
bottle
burn
chemical
chemistry
compound
corrosive
danger
dangerous
destroy
factory
glass
hazard
hazardous
hydroxide
industrial
industry
lab
label
laboratory
liquid
lye
manufacturing
material
object
poison
product
reaction
research
risk
scale
science
skin
sodium
solution
substance
symbol
test
warning
wash
water
white