横向
1
Nerve cell in the brain
4
Measure of matter in an object
5
Our home planet
8
Push or pull on an object
9
Magnetic metallic element
纵向
2
Smallest unit of an element
3
Mass per unit volume
6
Gas essential for breathing
7
Hottest planet in solar system
10
Second lightest element
11
The Red Planet
12
Amplified beam of light