横向
1
Second lightest element
3
Positive particle in nucleus
7
Ball of burning gas in space
8
Substance with pH below 7
纵向
2
Center of an atom or cell
3
Particle of light
4
Unit of electric potential
5
The Red Planet
6
Infectious microscopic agent
Second lightest element
Positive particle in nucleus
Ball of burning gas in space
Substance with pH below 7
Center of an atom or cell
Particle of light
Unit of electric potential
The Red Planet
Infectious microscopic agent