横向
1
Unit of electric potential
3
Substance with pH above 7
4
Our home planet
9
Mass per unit volume
纵向
2
Path of a planet around the sun
5
Substance with pH below 7
6
Group of similar cells
7
Unit of force
8
Preserved remains of ancient life
Unit of electric potential
Substance with pH above 7
Our home planet
Mass per unit volume
Path of a planet around the sun
Substance with pH below 7
Group of similar cells
Unit of force
Preserved remains of ancient life