横向
1
Preserved remains of ancient life
3
Molten rock beneath Earth surface
5
Ball of burning gas in space
6
Positive particle in nucleus
纵向
2
Nerve cell in the brain
3
The Red Planet
4
Tectonic landmass section
7
Smallest unit of an element
Preserved remains of ancient life
Molten rock beneath Earth surface
Ball of burning gas in space
Positive particle in nucleus
Nerve cell in the brain
The Red Planet
Tectonic landmass section
Smallest unit of an element