横向
1
Substance with pH above 7
4
Nerve cell in the brain
6
Biological catalyst
8
Form of thermal energy
10
Gas essential for breathing
11
Unit of electric potential
纵向
2
Curved glass that refracts light
3
Our home planet
5
Unit of heredity
7
Fourth state of matter
9
Unit of force
12
Tectonic landmass section