横向
1
Ball of burning gas in space
4
Second lightest element
5
Absolute temperature scale unit
7
Precious yellow metallic element
8
Smallest unit of an element
10
Disturbance that transfers energy
11
Unit of electric potential
纵向
2
Nerve cell in the brain
3
Tissue that contracts for movement
6
Mass per unit volume
9
Form of thermal energy
12
Icy body with a tail near the sun
13
Unit of force