横向
1
Measure of matter in an object
4
Mass per unit volume
5
Second lightest element
8
Unit of energy
11
Nerve cell in the brain
纵向
2
Our home planet
3
Hottest planet in solar system
6
Amplified beam of light
7
Infectious microscopic agent
9
Element found in all living things
10
Blocking of light by a celestial body