横向
1
Particle of light
3
Form of thermal energy
5
Group of similar cells
8
Smallest unit of an element
纵向
2
Nerve cell in the brain
4
Hottest planet in solar system
6
Reddish electrical conductor
7
Mass per unit volume
Particle of light
Form of thermal energy
Group of similar cells
Smallest unit of an element
Nerve cell in the brain
Hottest planet in solar system
Reddish electrical conductor
Mass per unit volume