横向
1
Path of a planet around the sun
4
Curved glass that refracts light
5
Gas essential for breathing
6
Substance with pH below 7
8
Our home planet
纵向
2
Nerve cell in the brain
3
Icy body with a tail near the sun
7
Basic unit of life
9
Preserved remains of ancient life
10
Substance with pH above 7
11
Unit of heredity