横向
1
Basic unit of life
4
Molten rock beneath Earth surface
5
Unit of power
6
Center of an atom or cell
7
Substance with pH below 7
纵向
1
Icy body with a tail near the sun
2
Group of similar cells
3
Fourth state of matter
6
Nerve cell in the brain
8
Precious yellow metallic element
9
Our home planet