横向
1
Compound containing oxygen
4
Basic unit of life
6
Gas essential for breathing
7
Natural satellite of Earth
10
Tissue that contracts for movement
11
Ball of burning gas in space
12
Reddish electrical conductor
纵向
2
Gas form of a liquid
3
Biological catalyst
5
Precious yellow metallic element
8
Positive particle in nucleus
9
Curved glass that refracts light
13
Nerve cell in the brain