横向
1
Chemical element in table salt
4
Substance with pH below 7
7
Curved glass that refracts light
8
Unit of electric potential
9
Group of similar cells
11
Disturbance that transfers energy
12
Hottest planet in solar system
纵向
2
Mass per unit volume
3
Precious yellow metallic element
5
Tissue that contracts for movement
6
Naturally occurring inorganic solid
10
Magnetic metallic element
13
Nerve cell in the brain