英文關鍵字
biology
bond
chemical
chemistry
compound
connected
dots
education
element
formula
h2o
hydrogen
inorganic
lab
lines
liquid
model
molecular
oxygen
research
schematic
science
scientific
structural
structure
substance
technology
water
英文關鍵字
biology
bond
chemical
chemistry
compound
connected
dots
education
element
formula
h2o
hydrogen
inorganic
lab
lines
liquid
model
molecular
oxygen
research
schematic
science
scientific
structural
structure
substance
technology
water