横向
1
Gas form of a liquid
2
The Red Planet
3
Fourth state of matter
4
Element found in all living things
5
Unit of heredity
8
Nerve cell in the brain
9
Disturbance that transfers energy
纵向
2
Naturally occurring inorganic solid
3
Positive particle in nucleus
6
Infectious microscopic agent
7
Curved glass that refracts light