横向
1
Path of a planet around the sun
4
Group of similar cells
5
Compound containing oxygen
9
Disturbance that transfers energy
10
Element found in all living things
纵向
2
Mass per unit volume
3
Reddish electrical conductor
6
Unit of power
7
Blocking of light by a celestial body
8
Natural satellite of Earth
11
Infectious microscopic agent
12
Unit of heredity