横向
1
Center of an atom or cell
2
Form of thermal energy
4
Unit of electric potential
5
Unit of force
7
Reddish electrical conductor
9
Tissue that contracts for movement
纵向
2
Second lightest element
3
Tectonic landmass section
6
Push or pull on an object
8
Element found in all living things
10
Ball of burning gas in space
11
Naturally occurring inorganic solid
12
Particle of light