横向
1
Positive particle in nucleus
3
Curved glass that refracts light
4
Preserved remains of ancient life
5
Substance with pH below 7
7
Gas essential for breathing
9
Icy body with a tail near the sun
纵向
1
Tectonic landmass section
2
Unit of heredity
6
Substance with pH above 7
8
Absolute temperature scale unit