横向
1
Natural satellite of Earth
4
Compound containing oxygen
5
Our home planet
6
Mass per unit volume
7
Group of similar cells
8
Chemical element in table salt
纵向
2
Biological catalyst
3
Curved glass that refracts light
9
Smallest unit of an element
Natural satellite of Earth
Compound containing oxygen
Our home planet
Mass per unit volume
Group of similar cells
Chemical element in table salt
Biological catalyst
Curved glass that refracts light
Smallest unit of an element