横向
1
Gas essential for breathing
3
Substance with pH below 7
5
Compound containing oxygen
8
Precious yellow metallic element
9
Positive particle in nucleus
10
Path of a planet around the sun
11
Our home planet
纵向
2
Blocking of light by a celestial body
4
Unit of energy
6
Icy body with a tail near the sun
7
Unit of force