横向
1
The Red Planet
4
Basic unit of life
5
Group of similar cells
7
Natural satellite of Earth
8
Ball of burning gas in space
9
Blocking of light by a celestial body
10
Second lightest element
纵向
2
Biological catalyst
3
Mass per unit volume
6
Compound containing oxygen
11
Curved glass that refracts light
12
Magnetic metallic element